I'm running on a G4/466 and I run all of my renders at 1600x1200 on a 1:1 ratio and performance is really snappy. Reliability under OSX 10.1.2 is phenomenal and you'll love that you can run a render and switch out to do a thousand other things. The only advice I have is to run tons of RAM since if OSX starts to page to the vm swapfile, things can get kinda ugly. I run 1.1 Gig in my machine and it's plenty quick although a DP 800 would be nice! But yes, it's more than worth it!