People here are saying these sound artificial, they have too much bass, treble is weird or whatever.
Truth is, these are my perfect headphone, and if you're someone like me, who isn't a seasoned audiophile, and doesn't care about the sound maybe, possibly not being 100% natural and neutral, you're gonna love these!
 
These have the wow-factor. They sound great. They sound fun! And that's what I want from my headphones - they need to make me want to listen to them. And these just do. If they sound unnatural (which I'm not convinced they do) to achieve this - fine by me. Just make my music sound awesome. And these do exactly that.
 
Bass ir strong. Are these heavy bass cans? I say no - most of the bass is located low down. They do have an emphasis on sub bass and the kick you get from these, when the music calls for it, is fantastic. No mid bass / high bass bloat. Bass sounds clean and controlled. And powerful.
There's a hint of some treble spark. It's just a little (and perfectly IMHO) elevated.
Mids may be recessed somewhat compared to treble and bass, but they're still upfront and never sound dark.
And then there's the soundstage. So much wider and more open than other cans I've tried. The instruments are playing all around you, rather than inside your head.
 
The only thing these are a little lacking for me is "opennness". These are not transparent on your ears - they do isolate quite a bit of sound. With no music playing, you can still hear your own voice and your surroundings, but once the music starts playing, the rest completely disappears. But this is just a minor gripe.
Easy to drive, comfortable, great looking, well built. Got one of the last pairs on Amazon.co.uk for 180 pounds and couldn't be happier with my purchase. Gaming, music, movies - these do it all.
 
P.S. You're not taking these outside - they're not portable, they have retardo-huge earcups and are not that easy to drive. My phone can push them, but to fairly low levels and not enough to drown out background noise, since these are open.

Not an audiophile, but here are my most notable impressions of these in ears:
 
They're V-Shaped
Natural, warm, accurate, true to life are not the words I'd use to describe these headphones. They're fun though, and for on-the-go listening, I think these are great, since you won't be looking for detail of the n-th level while walking down the street, or standing in a bus.
 
They have bass
Quite a lot of it. I'm no expert on bass bleeding in the mids, but I suspect there might be some splash into the midrange. Most of the bass is in the mid to sub bass region, which is good, and the bass doesn't sound boomy. It has a lot of impact and get's pretty deep.
 
They have forward and "splashy" treble
There's some emphasis on the high-mid to low treble frequencies, but not as much as I would have expected. It does have a lot of extension though. It sometimes makes some instruments and sounds, like cymbals, sound overly emphasized and in your face. Also, while this is going to depend, I find these earphones sometimes get a little sibilant on certain tracks. Not to the point where I can't listen to them anymore, but enough to make me think of lowering the volume ever so slightly.
 
Midrange is recessed
It's not a bad midrange though. It sounds smooth and natural. Most of the time, vocals don't seem to be buried under the treble and bass, however it can happen on certain tracks. Most notably those, that I know have backing vocals, and I have to kinda search for them in the mix, whereas on other headphones they're just there.
 
Soundstage is good
Not something I would write home about, but enough to keep my interest. Imaging though, IMHO is not the best. Everything sounds slightly outside of my head, but I wouldn't be able to tell exactly where from. Just the general direction that the sounds are coming from.
 
Wire is sh**
It's thin, quite long and it remembers that last time you put them carelessly into your pocket and they got tangled.
 
They're quite big
You're not going to wear these under your hat - you can forget about that.
 
Isolation is... meh
They're shallow fit, so..
 
Foam does wonders with these
It takes away a little bass and some of that overly splashy treble and converts it into a bit more midrange and soundstage. It doesn't really change the overall signature of them, but those slight I'm all for those slight changes in these earphones.
 
Would I buy them again for 80$?
Yeahp. They're fun, they're good looking, have a 3 button remote for both android and iOS (separate models) and they sound a helluva lot of cleaner than my previous IEM's - AKG K323. Oh, and they sound fun. 
Compared to AKG K323: AKG's have the same amount of soundstage I feel, but the imaging is very accurate. And because they sit so deep into your ear canal, it sounds slightly freaky when a violin is making sounds right outside of your right ear. Also, because they go so deep into the ear canal, they're more comfortable and way less conspicuous. As for sound, the AKG's have less bass, that gets just as deep, they have less treble splash, but more emphasis on mid and low treble, and they sound dark AF. Something about those mid's I just can't accept. Also, the wire's ****, and is shorter, so it's even worse.
 
I prefer Momentum In Ears, over AKG K323 - they sound better and cleaner. AKG's have their moments, but most of the time, I don't regret spending nearly 2x on the Senns' as my replacements.