Pros: Treble detailing, spacious sound, wide soundstage and layering
Cons: Bass, not enveloping, slightly thin sounding at times, a tad sterile
Just want to state up front my review rating is an absolute rating, not one based on comparative performance, pricing etc.
These are my observations after using an iBasso DX50, MacBook air, FiiO E17 and Sansa Clip Zip as test sources. I found very little variation between those sources with the DX50 maybe bringing out a little bit more richness and depth.
Highs: Well what can I say, the treble is of such a high quality I was surprised. They can be a tad sibilant depending on what you are listening to but generally I would say the highs are of a very high quality not far off earphones that cost a lot more. Detail is there in spades and the wide soundstage and layering is also very good.
Mids: A repeat of the highs really. Very wide, layering even better than in the highs. The start of the weaknesses appears in the mids however. At the lower end things start to fade away and lower mid sounds that should be there are pushed way back. This takes away from the richness of the sound making the overall presentation quite thin. Such a shame.
Lows: If you are even a mild bass head then look the other way, these do not deliver anywhere near the right level of bass. I could not find one track that sounded as it should. The bass was either veiled or just not there at all. I tried every tip available and others I had. Nothing helped. If Rock-it can get the bass right on their next release we could be on for a fantastic pair of earphones.
Overall: After living with these for a couple of months I am deeply frustrated. Rarely at the lower price ranges have I found anything near what I could call 'very good' sound quality. Most things sound cheap, unnatural, unbalanced or just plain wrong. I am happy to report that if you can live without much bass then these are a bit of a bargain. The build quality, as others have pointed out, leaves a lot to be desired. They feel very delicate and may break easily. Another point is the physical size of these, they are tiny. I find that a good thing as the fit snuggly in the ear and once inserted remain in place no matter what you are up to.
I am very much looking forward to the next release!