I liked the sound. Funny thing is, I just tried them today at a local best buy and they seemed to sound better to me than the other headphones on the wall. The Magnolia guy told me it's because the board they use to run the headphones doesn't do them any justice, but the HD558's sounded good because they were easier to drive. I kind of figured that. It's a shame they don't properly amp them.
Anyways, I liked the sound. I didn't think they were too bulky. It (the sound) just didn't feel like what I was looking for in a headset. Bass was OK, not great and the mids and highs were good, but I know it could be better. If I have to spend a bit more money to get what I want then I will. I just wish there was a store that sold a better selection of headphones in Orlando so I can try them out..
So the search is still on. $400, closed headphones, detachable cable.