The XRandR support in the driver is not yet stable [1]. The 302.xx line is currently in beta, but will support both XRandR 1.2 & 1.3 at the same time. That part also works flawlessly, however, your mileage may vary in regards to suspend/hibernate, since both I and multiple others on the nvidia forums experience serious problems with resume from either, i.e. the computer hard locks (and doesn't even respond to ssh etc.), which requires you to powercycle it. So while the XRandR is a huge step forward, it is not without problems yet.

[1]: ftp://download.nvidia.com/XFree86/Linux-x86_64/latest.txt shows you the latest stable driver, which is 295.59