I bought a G5 Pro back in the day, the last with the Motorola chips. The thing was a beast, even though the hardware was superseded by the intel architecture. I used it as my rendering rig throughout university, and the machine kept chugging along for years and felt perfectly fine and snappy all the way up to when OSX dropped support for it.

I ended up gutting the case and building it into an ATX machine, and eventually sold it to a friend. But it was a fantastic computer.