My 24" 2.4 has been very reliable and solid. upgraded to 2gb with a stick of ram from a pc shop. maybe kingston? When I initially got the iMac I tried doing the migration assistant from a G5 powermac and ran into serious issues. After migrating I had several crashes. I did a clean install and have had maybe one freeze since then. I got it like 2 weeks after it started shipping. I've tried some of the specific things that people have reported as crash triggers and mine doesn't crash.