I just picked up a dual 533 MHz PowerMac G4, I have always wanted one since they came out. I picked up this MINT computer for 25 dollars. Amazing since this cost 3k just 10 years ago. Any who, it has 256MB ram, and soon to be 1GB. It has Tiger now, but can I upgrade to Leopard with out any issues? I have read mixed reviews and I just want to hear it from people instead of just reading it. On another note, some of the thoughts for this Computer are just amazing. Like powering off and on the computer from the monitor. The great looking monitor with a cord hole in the back stand. Easy opening case with handles for greater ease of moving. Two USB ports on the keyboard so your mouse can be on the left or right. Plus 2 USBs on the back of the monitor. Of course I have had faster macs, hell my iPhone 4s out specs this thing. But this is a very well designed computer, and I would have hated to be any other computer manufacturer when this hit the public.