I normally use Software update but I couldn't get the download to complete last night as the servers were probably being hammered so went with the Combo Update first instead:
Preparation: Full clone with CCC.
Attempt 1 - Downloaded Combo update:
KP During installation. Force shutdown then she auto rebooted once, all seemed well except disk utility was showing a lot of unrepairable file permissions.
Cloned back to 10.7.2
Attempt 2 - Using Software Update:
Installed the same as my MBP, no problems or KP, left sleep installed everything still working just required HDA rollback. No permission errors.