There are lots of threads about the 650s at:
http://www5.head-fi.org/forums/
Most people seem to think the 650s are a big improvement on the 600s.

Richard


"Tom Jackson" wrote in message
...

I currently use Sennheiser HD600's as my main headphones, but I've
heard very good things about the new HD650.

Has anybody tried/bought a pair yet, and be willing to share any
opinions?

thanks,
tom.