I am having massive problems with 3.4. On my Nforce 2 board using the Nvidia IDE drivers, I get almost certain system hangs at any warm boot. Even rescanning for the device when I can get into Windows after a hard boot will cause a complete system lock-up. It looks like 3.4 has completely reverted any of the earlier fixes put in for the Nforce boards.
I've had to go back to 3.2 which has none of these problems.