Got my set of Orange MH510's today, and couldn't be happier. For the money, these are the best cans I've used. I haven't really tested them on a high-quality source yet, but for average music listening (see: streamed), they are amazing. Nice, even and flat response, from what I can hear. They are much less bass-heavy than a lot of headphones I've used. That's not to say they don't produce bass notes, but rather, they don't have the silly overpowered feel of a lot of cans.
Anyway, I haven't even broken them in yet, and I am a happy woot-er.