Its very clean sounding In-Ears.
I am not a person requiring huge amounts of BASS but the BASS on RE0 is slightly less than I would have liked i to be...Having said that I find BASS to be quite Tight. 
Sound Stage is average.. Instrument Seperation is quite good.
With the Amp, for which I paid a small extra,.. it sounds even better.
 
The White Bi-Flanges are perfect for my ears.
Am able to have them for prolonged times.