I have a Power Mac G4 dual 450 that I purchased September 1st 2000. It has all the original equipment. I added memory up to 1.25 GB SDRAM, Adaptic SCSI Card, and Zip 100. Now running Mac OS X 10.3.5. I use it for fiances and web browsing. Since the end of January it has been running 24/ folding. No problems encountered. Just would like an estimate of what I can expect. Many have told my wife that they are surprised that we are still using a machine of this age.