I tried it a couple of weeks ago and found the performance quite poor (terrible videp artifact, stuttering, sound distortion, etc) It was unusable, reverted to 6u26 and all was well. Maybe it was just my particular frankensteined build of PMS. Be interesting to know how others are fairing.
SubJunk Build or Custom from SVN (depends on my mood)
Xubuntu x64 (3.2)
AMD 64 X2 4800+ [OC 2.8GHz]
JRE 6 u[latest]