I must begin by stating I am an aspiring audiophile since I heard a HE6 connected to it's EF6 and actually was able to listen to the direction of a jazz singer's voice realtive to the microphone and got chills up and down my spine. I currently cant afford such an expensive setup but it does not stop me from trying to find cheaper gear to enjoy my extensive and rather eclectic music collection. I must confess I am also a musician and a very skilled guitar player so I know how I like my highs and lows by heart.
 
What I got from these cheapo phones was almost jaw-dropping accuracy for such an insane price and the most balanced and transparent sound south of 100 dollars in my almost hi-fi audio deprived country. To begin these are the most affordable open cans that sound right and perhaps even further than right. It is no surprise that their sister brand Superlux is highly regarded in head-fi forums.
 
The box they come with has a nice diagram that shows the exploded view of this remarkable product, unfortunately there is no bag nor box to carry them but that is more likely to be absent at this price level anyway. There is an adapter however for non portable hi-fi components. The box states these are "Digital Monitors" which means little to me for I have plugged it to my analog sources with pretty good results.
 
Althought the cans look plasticky and cheap they are sturdy, cable is thick enough althought I'd prefer a beefier one. The level of confort is more than acceptable and they clamp very little while not falling over your head if you tilt your noggin down.
 
The pads are kinda shallow and I want to replace them by velour or deeper ones if I find ones that fit. I am pretty sure SQ will improve dramatically by posisioning the driver grille a little further  but the guys at Samson did it right by covering the driver grille with synthetic fabric so it does not press your ears so they are really comfy. My only gripe is that materials seem utilitarian rather than comfortable here and these are not winning any design contest for their rather derivative looks.
 
These  won't turn any heads for they are big and dull looking but discrete enough to take them out for a walk if the place is not noisy however the 10 foot cable would require a velcro strap or a similar measure for portable use and being open means you will hear external sounds and they will leak sound to the outside so wearing them in the tube will force you to raise volume to unhealthy levels.
 
The Samson's are rated 32 ohms of impedance but won't sound very good out of low powered mp3 players. Amping them with the inexpensive and somewhat warm FIIO E6 would be a very nice idea for they open up and soundstage widens when amped. Drivers are coupled to ultrathin mylar diagphams.
 
Although the sound of these cans is seems  rather balanced they seem slightly W-shaped in terms of sonic signature if that makes any sense. layering and soundstaging is superb for the price.
 
The treble is tamed without losing shimmer and the bass sounds surpinsingly controlled and present even though I am not sure how deep in the sub-bass region they can go, bass sounds so well that it never gets overwhelming or bloated (balanced) you hear the notes clearly. The RH600 portray the in your face kind of presentation similar to a Grado can for the mids sound a tad forward although they are never shouty or shrill as some Grado cans are.
 
The  overall coherence of the sound makes them very musical to my ears and leave many pricier alternatives to shame. In fact they are fast enough to avoid smearing fast-paced notes and I tested them using the infamous Mogwai's "Mogwai Fear Satan" and they passed the test with flying colors, not a single note smeared. The bass layering is indeed astounding for an open heaphone and even though they are not the most resolving cans I heard I can think of any open set (or any closed one ) near it's price that sound as detailed as these.
 
I don't know how long they will last for they seem somewhat flimsy but the warranty is long enough to be happy with the purchase. To be consice they are as resolving, airy and transparent as their little price tag can buy and leave nothing to complain and no glaring sonic faults of any kind to steer away from them.

Thanks to madiaplayer.cl the best audiophile-oriented shop available in Chile I got a M1 sample to test drive it and provide my opinion so you can give them a try if you like my description. This is my second review so please forgive any mistake here.
 
Packing
 
The M1 box is made of softened cardboard wich contains a transparent window that allows you to see the housings very similar in that respect to every single Brainwavz box and it is similar to the Pro Alpha package however, it is a more compact, a better designed one and its also easier to open. On its front Brainwavz tells you that M1 has a balanced sound , has a comfortable fit and that they come with a silver plated OFC cable. In the back of the box youl find technical details, information regarding the contents and accesories. It is also stated that the set has 1 year of warranty if bought from an authorized reseller of course. Inside the box you'll find another cardborad box that wraps a moulded plastic container wich displays the headphones themselves and a clamshell semi-hard case wich contains all the tips plus the warranty card. In the top of the outer box you will find the phrase "IN EAR MONITORS".
 
Accessories
 
The included accesories are: shirt clip, 1 set of Comply foam Series S tips, 6 silicon tips (S,M,L) . Most people can have good seal with the provided tips I personally used the mid silicon tips with acceptable fit
 
Build
 
Starting by the housing I can tell you that they feel solid but not abs kind-of strong but most people will not be able to damage them unless the yank the cable. Anyway they feel consistent and solid enough. the bore is about 4 mm. wide and is protected by a metal grille. The front porion of the housing is also made of metal and the rest is plastic but they dont look cheap. There are visible side vents and a tinny vent in front of each driver just beside the bore. the insertion level is moderate due to the housng design that resembles the rubber protected Pro Alpha except for the lack of rubber that is replaced by a plastic fender. Unfortunately M1 is missing rubber or moulded strain reliefs in the cable exit so they have a very obvious weak point.
 
The channel indicators are properly printed and are visible enough but there is no bump or Braille code marking to distinguish the housings after sunset.
Cablewise the M1 is a very good iem for the cable has memory but not at an annoying level. cable is shiny and not tangle prone but it is a little bit rigid though and it is terminated in a 45 degree angled plug which is a great decision in my book. While the ergonomics are good enough I would add a slightly deeper insertion to improve linearity and isolation.
 
Isolation and microphonics
 
Due to the side vents isolation is fair but not better than average. You may find improvements using the included Complys. The cable trasfers very little noise
 
My audio sources for the test
 
A 2006 Mac mini running VLC with a FLAC 24/96 playlist an no EQ
Ipod Nano 5G/8gb loaded with 320K mp3's without EQ
An Ibasso LOD plugged to my trusty FIIO E6 for amplification testing
A Nokia C7 with 16Gb of music in mp3 320K and 256K resolutions  inside a class 10 MicroSD. Ufortunatery the Symbian music player cannot disable EQ
 
 
 
Selected tracks from the following artists chosen for the test run, most of them 24/96 Flacs or Ape quality
 
Lali Puna (indie electronic pop), Massive Attack (triphop), Tool (progressive metal 24/96), Autechre (Exai (IDM 2013,32 bits 24/44) y Amber) , Pixies (Indie rock 24/96), Tricky (triphop), Cibo Matto (pop/hiphop), Crystal Castles (electrónica amd noise), Daft Punk ( House), Pulp (britpop), The Brooklyn Funk Band (Chesky,24/96),), The Roots (hip Hop), Guided By Voices (Rock/Lo-fi), Jaco Pastorius (Funk Jazz circa 1970) , Leftfield (EDM), Rihanna (pop), Digitalism (EDM), Rage Against The Machine (Rock,24/96), Muddy Waters (Blues), Pavement (rock ,alternative), Art Blakey (Jazz circa 1960) y Puscifer (Indigo Children (JLE Dub Mix), an excellent track to test sub bass and mid bass, triphop 16/48). Astor Piazolla y Kronos Quartet (Tango instrumental), Rebecca Pidgeon (Country, Chesky 24/96)*  KMFDM (Metal and EBM) Supersilent (Free Jazz, experimental).
 
 
Sound Quality
 
I liked the M1 Presentation. I find it cohesive in spite of the treble extension which is not better than the rest of the M series. Treble decay and extension is in fact very close to ideal but nowhere near B2 levels (I know it's not fair to mention B2 here). Anyway cymbal crashes sound much better in the M1 than the treble crippled Pro Alpha. There's a sense of warmth that makes Jazz recordings sound full but not dark. There is little to gripe about these. The clarity and detail resolution is impressive for the price as well as separation which may not be poinpoint accurate but leaves most of the competing sets on this price bracket to shame giving a good run for their money.
.
Distorted guitars are a problem for lo-fi and mid-fi iems, but the capable M1 driver can be very snappy and misses very few details in really intricate parts of fast paced music and there is  more than a hint of sparkle that does not prevent the M1 to lean to the warm side of analitycal. A commendable feature that put's the M1 in the neutral side of things amongst its M brethren. In fact the M1 makes it possible to distinguish between a 128K MP3 track and a Flac 24/96 file in a transparent fashion.
 
The M1 has a relatively high impedance and its neccesary to raise the volume a little more tan half way on an unamped IPod to reach listening levels in a bus or the tube.Even at insane volumes the M1 will not distort so its better to be careful and avoid raising the volume too much.
 
Voices and mids in general are only slightly below linear levels (nitpicking here) in the M1 soundstage. It would be exaggerated to call M1 mids recessed
they have an open flavor and are a little warm so they can image very rounded male and female voices. Lyrics are easy to understand.
 
The bass on the M1 is controlled and has good extension reaching sub bass levels but keeping a rounded tone althought not completely full: There is a good speed recovery that makes the Pro Alpha sound boomy and much less precise in comparison. The M1 single dynamic driver moves less air and its bass is more refined than Pro Alpha's and is probaly leaner than Soundmagic E10's. but it's more informative than the latter.
 
The M1 have certain qualities that makes them really close to a truly great monitor and I would use it for tracks mixing but it lacks some (very little, nitpicking here) treble extension to be used in professional situations. The M1 soundstage is spheric and wider than
its depth but enjoyable all the same
 
Final Words
 
In conclussion, if you are in a tight budget and cannot spend money in a Vsonic GR07 or a  Single BA and prefer a mostly neutral sound signature you can't go wrong with the M1. These are versatile and very musical iems.

I bought this little guy for I could not bear the V-MODA Crossfade LP Over-Ear Noise-Isolating Metal Headphone (Gunmetal Black) sound signature (everybody makes mistakes right?). While they are the most comfy headphones I got, the bass overshadowed every part of the mids. They also eat a lot of battery power for a 32 ohms headphone.

Luckily I could survive this purchasing mistake due to the help of the little FIIO E6 which I bought after some research for its EQ options and the possibility of using a FiiO L3 Line Out Dock (LOD) Cable For iPod and iPhone so no battery will be drained from the power hungry V-Modas. I found that the third setting, the blue colored led option boosted the mids so nicely that made a huge improvement in SQ.

Later on, about 6 months ahead the Crossfades got broken in the left side plastic piece that holds the headband so I got them replaced by the glorious V-MODA Crossfade M-80 On-Ear Noise-Isolating Metal Headphone - White Pearl that are one world appart. Clear balanced , efficient and portable too. I got a complete eargasm as a replacement set. The M80's are rated at 28.8 ohms which means a slight less battery drain but in the real world is a more efficient headphone. Before I plugged the M80's I used an Akg K518Lewht K 518 Le Limited Edition Headphones (White) with the Fiio in the flat EQ (no led) with 320K mp3's with very good results.

It turns out that the little FIIO actually flattens the M80 soundstage and make it sound a little artificial and dull. So for a better set of headphones this little guy can do more harm than good although it can work very well with some sets that lack bass or have a noticeable bump in the lower mids that makes the sound veiled or muddy. For the Crossfade LP it is a miracle. For the M80 it is not a compliment neither a necessity.