When I initially upgraded to 10.6, (SL) there were some annoying glitches with Lightroom & PS, and went back to Leo. After 6 months or so of revisions, all was well.
I'm really not in the mood to bother with 10.7, as things are working fine. As far as the Windows/Bootcamp flash drive problem, I cannot help you.
What I have found, an example:
1. A 1.5Gb file takes 5-6 minutes to copy to a flash drive on my 2011 MBP.
2 Same file/same flash drive takes less than a minute on my PC.
Firewire 800 on the new, 2011 MBP is slower than FW400 on an C2D MBP.