i reinstalled my 7300 several times last 3 months.
os9 helper keeps generating troubles:
the first reboots everything runs fine and a shuts down quite fast.
after a while it looks like the mac shuts down too fast and always reboots with a disk-first-aid recovery.
after some weeks dfa can't recover and only diskwarrior or norton utilities can recover most of the disc.
never had such problems with 9.1.
it looks like disk caches aren't written when shutting down in 9.2.x