Reviving this old thread to say that, @ $20 (the price I paid for them a few months back), those are absolutely a steal! 
They can be little bass monster with the right tips, they don' require any specific amp, will sound great with a low powered smartphone and deliver a superb and addictive sound.
They are well balanced and don't sound too V-shaped to my ears (I'm listening to my music at quite low volume -50 to 60 dB-, so YMMV if you're listening to your music at higher volume), they have very good details retrieval and a superb soundstage, not too much "in your head", which is quite surprising for an IEM.
Highs are sparkly but they never sound harsh or sibilant to me, and bass is well controlled and quick, I suspect they have powerful magnets to drive them!
All in all those are hidden gems, especially at that price as they come with a good packaging, 2 complete sets of excellent tips (S/M/L in balanced and bass version), unlike most other budget IEMs companies, and they are extremely well built, tiny and lightweight, sitting flush in your ears.
The only downside could be that they have a non-detachable cable and I know that's a "No Go" for a lot of users, but I'll take that minus without any problem in front of all the plus those IEMs bring with them!
Well done Hidizs / Hiby, I really don't know how they flew under the radar as they are that good to me!
They can be little bass monster with the right tips, they don' require any specific amp, will sound great with a low powered smartphone and deliver a superb and addictive sound.
They are well balanced and don't sound too V-shaped to my ears (I'm listening to my music at quite low volume -50 to 60 dB-, so YMMV if you're listening to your music at higher volume), they have very good details retrieval and a superb soundstage, not too much "in your head", which is quite surprising for an IEM.
Highs are sparkly but they never sound harsh or sibilant to me, and bass is well controlled and quick, I suspect they have powerful magnets to drive them!
All in all those are hidden gems, especially at that price as they come with a good packaging, 2 complete sets of excellent tips (S/M/L in balanced and bass version), unlike most other budget IEMs companies, and they are extremely well built, tiny and lightweight, sitting flush in your ears.
The only downside could be that they have a non-detachable cable and I know that's a "No Go" for a lot of users, but I'll take that minus without any problem in front of all the plus those IEMs bring with them!
Well done Hidizs / Hiby, I really don't know how they flew under the radar as they are that good to me!