M&D seem to be very hush about them. I kinda wonder if they are having some production / quality issues with them as I have been checking their website since launch and they have never had any stock ready to ship.
holly... really... is dennon so dead around here that this has been sitting online since the start of June and nobody noticed:
Yes I own them (pro500s). They have a great powerful sound. There is a thread here on them with quite a few people being impressed by them. IMO Yamaha made a mistake of styling them on the beats, so no audiophile wanted to touch them and people who wanted beats bought beats.