Its speed lives up to any Apple bragging. I haven't been able to test many apps yet, but everything happens almost instantly. My Geekbench score was 7837, with the Quicksilver scoring 504 on the same test. I will test again when I get the additional memory modules; supposedly the Mac Pro prefers at least four of its eight RAM slots filled. There's also speculation on some Mac Web sites that an update to Mac OS X (10.5.2), expected during Macworld next week, will bring further speed improvements to the Mac Pro. I will post benchmark results on the blog as I implement upgrades.