I am getting ready to upgrade my G4 PowerBook 400 to 10.3 this weekend but I am hesitant based on a couple of things I've read over the past few days. Aparently there were early issues with some Firewire 800 drives using a certain chipset as well as ongoing problems with FileVault and user preferences. I was also getting ready to purchase a new 15" PowerBook but am glad I waited based on reports of problems with the display. It appears that spacers in the LCD are causing white spots to appear on the display.