Got for using with my I9000GT and ATH-M50. I found that sometimes I wanted more bass and a slightly higher volume with some songs. The Fiio E5 solved this problem, for next to no money, hardly any extra weight or bulkiness either.

iPhone 4 contender, while getting your bang for your buck

Amazing sound for the price, fairly decent isolation, excellent build quality. Quite a strong punchy bass, not overpowering. Mids are smooth maybe slightly forward. Highs sparkle, can be slightly bright. But at this price who's to complain, jus do not buy if you have a bigger than average head. I also like the design, quite cool and stylish.
 
Very tight clamping on head, caused an unbearable pain after wearing for more than 10 minutes. more on ears than over ears.
 
Cable was a bit on the thin side, jack bent slightly during use.