I thought the standard solo's sounded pretty good (ok, a lot better than i was expecting, i was actually very impressed) through my sonyX>mini3 amp, unamped they kinda went flat and the low end was less controlled. I was also able to listen to a pair of the soloHDs', but they were in a display with a sony MP3 player, and there was a headphone splitter pluged into it, one side fed the soloHDs', and the other side was feeding a det of their IEMs. This set up sounded absolutelly horrible, i don't know what settings were on the sony, and i have a feeling having two pair of phones plugged in didn't help. the bass was muddy, boomy and overpowered everything to the point i took them off after about 30 sec, *blech*. After that i could understand why some absolutelly detest them. But i really want to go back with my set up and re-try the HD's.
LOTS of head-fi'ers HATE them with a vengance, personally i think its a bit missplaced. I think most here think they are overpriced (and they are for most folks here (IMO)). Most here look as SQ vs price above all else, so style, hippness, and a rap star endorsement are all negative factors.
I think they are getting a bum rap.. If you like them, buy them. I was very close to walking out with a pair after i tried the SOLO's. The HDs' apear to have cured the week headband issue.
I however, decided to reserch it a bit, and I held off buying a pair based mainly on all the poor reviews on this forum. Even though i feel the solo's are no where near as bad as they are claimed to be, I settled on a set of M50s' ( they are in the mail as i type this!) .
%95 of the posts i read claim the M50's sound VERY good (any Dr. Dre are polar oposites on this forum), and are a bargain at ~$100.00, they offer good bass and great overall sound quality. I figure it was a safe bet. When they arive though, I plan on giving them a good A/B comparison with the SOLOs'.
The sony XB's are roundly aplauded by bass heads here as well.