Of course, I have to be different........
I have the 570's and LIKE them. They are very comfortable.
I like the sound. But I listen to mainly classical music. They are also much lower impedence than 580/600 so can be driven by portables.
I think their response, unlike the rolled off 600/580's is flatter on the high and low end, or maybe a little up on the high end.
I use them mainly on a Nomad Jukebox directly (It barely has power this way). And also with a Total Airhead. It's fine on any portable with the TA.
Different devices sound different. The nastiest two were the Archos 6000 jukebox and a Classic MP3/CD player. They sounded very nasty with the 570's. Then again, they both stank.
I found the Beyer DT990s brighter than the 570's. The Beyers were also smaller for my fat head. The 570's barely fit me.
The plug on the left headpiece is a bit annoying sometimes, as it can get intermittent if you tug enough on it.
Pricewise? They are worth about $120 or less.
But to be honest, if I could have returned them, I would have.
When they were delivered, I was in the hospital and my folks were at my apartment door at the exact time of delivery and signed for them. By the time I was able to evaluate them, the return period had expired. My decision would have been to return them, and keep using my Sony 7506's for portable use.
So I use them alot... more than the Sony's, but only because I have them.
I don't use them as my main phones. I use the HD600's.