I used these for about a week (a few hours a day). The bass was very disappointing. Many of the songs I listen to use bass tones as part of the beat which seemed to be very lacking.
I was disappointed to the point that I had to get different ones. I'm actually looking to sell them but I need to get to 15 posts first.
These are more for rock and instrumental music (ie classical). Anything with bass will just be a disappointment.
Although these headphones DO have incredible sound definition; the best I've heard infact.