I got my Z77X-UD5H running last night, but not without problems.
BIOS F7
2x8GB Crucial Ballistix Tactical 1600 MHz
Celeron G530 (temporary until Ivy Bridge CPUs are supported)
Nvidia 7200 (temporary, not supported, so GraphicsEnabler=No, running in dumb framebuffer mode)
No DSDT (used UserDSDT...