Been running on release Win7 64bit. Clean install on a new SSD drive. All performace ratings above 7.1, new SSD is at max of 7.9. I have had no issues performance or otherwise since the switch. I like to refer to Win7 as a new improved Vista, not a new OS. The driver pain that was initial release Vista is not present this time so no major issues.

The boot up memory foot print is about the same as Vista (or at least nothing seemed shocking to me). The disk space footprint for the OS seemed a bit bigger, so I have installed slow speed apps like Office on a secondary terabyte drive.

I am still on an old Phenom 1 with 8 Gigs of DDR2. Waiting for the Intel i9s next year before my MB, Proc, and ram upgrade. I also don't mess with processor affinity any more, the 4 cores seem to balance just fine. I do set non active max frames on my team to 15, which I think helps the most out of all the tweaks.

Oh and I have also converted all my systems except my new laptop to Win7. The only one on the 32bit version is my media center, better compatibility with random media center plugins and capture card drivers.

I guess if your on old hardware and XP, I would not bother going to Win 7. But if your on newer gear and Vista, the move to 7 is not all that big of a deal.