Wow, you all are fearless!
I am extremely cautious about X.9 updates before a new major update to the OS. Does anyone remember how bad 10.3.9 was, compared to 10.3.8? It's a real tedious process to downgrade a system, and I've noticed that Apple kind of goes lame duck with the last upgrade before the birth of the new animal... i.e. Leopard.
Dang people, slow down! If it ain't broke, etc.... Make music not upgrades!
Currently using: iMac 27" 2.66Ghz i5, 12GB RAM, 10.6 (Snow Leopard), Logic 9.1, Ableton Live (more and more), MH ULN-2, Genelec 1030a, my ears.
Original setup: LCIII 25mHz, 4MB RAM, OS 7.0, Logic 1.0