Pros: Soundstage has good depth, Bass is big sounding, Treble has enough seperation.
Cons: Needs amplifier to reach high volume, Needs equalizer correction due to 2khz hump, Build quality does not shines.
unlike the Brainwavz M4 & Xiaomi Piston, this one finally brings something worthy to our ears. when you plug these in your ears, first you'll notice the wide soundstage which especially shines in depth. this was the first earphone i've used which incorporates such amount of mid layering in this price range. it's very alike to the Vsonic GR02 in this manner. you can easily feel different frequency segments appear in different layers back and fourth. this makes it's acoustic very lifelike.
of course the need for the amplifier and 2khz equalizer correction need puts the r1 in the weak side of the comparison with gr02. but it still have it's own signature. i did already sold the product so there's no chance for me to directly compare them but if i remember correctly, r1 had more big sounding vocals compared to vsonic. vsonic products has more seperated vocals but they sound more compact in comparison.
overall, R1 definitely worths to try. however, i cannot recommend it against gr02 because of the above said reasons. without the 2khz correction, it's possible that you'll feel most of the songs aren't sounding natural. 5-6 decibels of 2khz decrement should be fine. my unit which was bought from mp4nation lost it's L, R markings on the day two, the glue markings on the case were visible + it was lacking a part of the cable finishing near the earpieces. okay, noone is able to say that it has a stunning build quality.
it surely feels cheap and there's nothing to do about it. but it sounds good for shure... does not lacks deep bass amount, does not have a terrible, mid ruining highs and incorporates a wide soundstage. as i said, it's not recommendable against gr02 bass edition in my opinion but worths to be tried, especially if you like deep soundstage and bored from vsonic.