Summary: I bought these a few days before 2012 christmas and damn i am still shocked at the amount of bass they have. These are very clear too in the vocals and i really loved hearing guitars in these headphones. The bass doesn't leak into the mids.
Summary: Have had these for 3 months after losing a pair of Pioneer HDJ 500s. Preferred the look and build quality of the Pioneers, but the Sonys look ok and fold up nicely. The HDJ 500s didn't fold, but had one swivelling earcup and came with two detachable cables.
Summary: Jazz sounds real good on these.
Classic music sounds pretty clear, like when the violin is playing and stuff.
Vocals sound pretty good.
80's sound vibrant.
dubstep/hardstyle, sounds pretty strong and BASS'ee
...now that i think of it, rock... hard metal and screamo...
Conclusion: We liked the Sony MDR-V55 as soon as we set eyes on them. The plastics used in the construction are perhaps a reflection of the affordable price point, but they've been sturdy enough in the time we've been using them.