I'm running it on a 300 mhz iBook with 192 mb RAM and it runs beautifully. No problems to report. It is not for amateurs though, yet, so don't get upset if you have a pile of peripherals that you expect to work immediatley and they don't. For day to day use it is wonderful though. I use AppleWorks 6.04 and IE 5 all the time. They work great. It is fun learning to use the Terminal window to tweak things. I also recommend Fire, if you are into using an IM client. It works perfectly as a replacement for my Yahoo chat program. I can chat with my Yahoo buddies and the app actually works better than Yahoo's app for OS 9, which they have not updated in way too long.