I had a PS3 for building for power/cell... until sony bricked the darn thing! :)

After that for a while my PPC test box was a dual g4 xserve but it stopped booting inexplicably.

I have talos now and am pretty happy with it, but even that still struggles to compete with epyc in terms of price/performance (though at least a comparison can be made there).

I have some memories of the Cell processor, none of them fond. That beast was the hardest thing to program I ever saw. It made the first generation Xeon Phi's look like a dream.

I think it just depended on what you were doing on it, I 'ported' the CELT (Opus predecessor) to it in like.. an afternoon.