Summary: Until they fix the ACVHD issues, hold off on picking this up or even switching to it... First time in a LONG time where Adobe has really let me down.
Pros: Very nice upgrade to Premiere CS5.5. Nice strides in workflow.
Cons: CS6 has a major problem with spanned ACVHD. Myself, I have a couple long/spanned clips that has choppy playback, frozen playback with audio unaffected. Who knows when they will fix it, if ever. http://forums.adobe.com/thread/1004369?start=0&tstart=0