I am running the SR 600 patch and my Pre is flying. I can't believe how fast it has been the last couple days. Scrolling through menus is completely smooth. Opening apss take 1-2 seconds at the most, unless they are bigger apps like dr. Podder or Pandora. In addition the idle battery performance is amazing. If I take it off the charger the battery indicator stays green for hours.

Down sides.

When I reboot sometimes the phone locks up right after it loads to the lock screen. I have to pull the battery to get back in. It also seems you have get past the lock screen right when it boots the phone so it won't lockup. Kind of strange. The good news it once it boots in and there are no initial lockups the phone is fine. I have been using mine for 5 days now without rebooting.