for the average computer user, even the more savvy Mac user ;-). Three things to keep in mind if you're going to run this: Safe Boot from shut down, not Restart. Be sure once you Safe Boot that no other apps are running (Dashboard excluded apparently), and carefully notice the installation buttons- Disagree is defaulted in the Wizard. This app ran correctly on my Dual 2GHz G5 with 9800 Pro, 10.4.2 and I look forward to its performance improvements including frozen cursor fix, wake from sleep, etc..