What I like most is of course bass response..it is more than enough, maybe a bit exaggerated, aggressive. Overall, I am really satisfied this excessive response in some genres.The only real problem it is prone to loudness noise of the record.. Maybe this is because the drivers are too sensitive. I am not that high end audiophile who can use technical terms to describe but this happens generally with lossless files...other problem might be ear pads for some.. smallest ones work fine but fit best no..the reason of isolation leak probably because of pads..I may change them with high quality ones.
Trebs rendering not detailed enough as basses but that does not mean bad they are as good as it gets behind bass response..not that sharp though. Mids are all balanced and has enough clearness in vocals and seperation of instruments. V-shape character makes it lively and suitable for pop of every genre. Mids in higher volumes are laided-back. Timbre quality of course not as same as high end JVC or Senns. Come on guys..this unit costs approximately 20 bucks and within that framework it is absolutely magneficent piece of equipment ...a steal.
It is highly recommended to low budget hifi people like me who wants bassy in ear with good isolataion and tangle resistant cord which can be used on the go. Many over priced in ears I tested are not good as Koss RUK 30K.in terms of basses. It is not your dreams in ears but cheapest thing very close to it. its price is unbeatable. It provides good solution for mobility in budget.It is not JVC HA-FX850 so you get much more from what you spent.
I really like listening chamber classics, rap,techno,new age and acid jazz records with this unit.It has stellar performance. Apart from those genres drivers have above medicore performance. I use another price/quality monsters Asus Xonar U3 and Fiio E17 . I can drive this unit (16 Ohm) with ease to 32-64 Ohm pro-gaming exiter mode and no problem I face till now. With that mode Depeche Mode etc..listening nearly above over-head quality of most respected brands' mid ranges.
It is made for mobile devices and works wonderful with any device but it gains considerable resolution with more juice like I stated above. Get one if you like punchy V shaped with good bass kicks without sacrificing mids.