performance 7/10
good sound quality and excellent bass
....
if you can get a good fit, they provide great sound quality and solid noise isolation . Once you get a good seal, you'll be rewarded with nice, tight bass response that is enveloping without being overwhelming, warm mids, and a high-end response that is clear and detailed. The headphones are also quite versatile, providing solid sound across all genres.
Compared with their step-down cousins, the MetroFi 170, the 220s offer ever-so-slightly improved sound quality--deeper, tighter bass and richer mids--for $30 to $50 more. Most people probably won't notice much of a difference
http://reviews.cnet.com/headphones/ultimate-ears-metrofi-220/4505-7877_7-33578709.html