I love my original 2006 Mac Pro — it's now my office computer at work (I take the barebones 21" iMac they plop on my desk every couple years and give it to someone else). I upgraded the processors to octo-core 3 GHz and shoved some more RAM and an SSD startup drive. I runs an ATI card that's probably 5 or 6 years old but does the job just fine. It runs the frankenstalled El Capitan installation — which until January was able to even fold in security updates. I'm sad that the operating system seems at a standstill now. I figure that's ultimately what will shut 'er down, when I can't run typical software or when the security risk is too high. But it's AMAZING hardware. People never believe me that I'm using a 12 year old computer.