I use or keep track of several Macs or clones (teardrop iMacs, iBooks of various vintages including a tangerine clamshell, a bronze keyboard PowerBook, some PowerComputing desktop clones, one of the early Performa all-in-one PPC units (5240??)), running variously 8.6, 9.0.4, 9.1, & 9.2.2 (plus a couple Xs). 9.2.2 seems fine, and isn't on all these units only because they're doing fine for their present uses (and IIRC some don't have enough memory to run 9.2.2).