Being a piano guy, I have a rather unusual one. A Yamaha CFIIIS 51GX, picked up under special circumstances (completely above board) during the early part of my time at Yamaha.
The GX series are experimental and the short lived 51 share a number of very specific technical traits of another company & Sons. It was not the nicest of the ones I had to select from, but these technical features hooked me for the sake of novelty. The problem is that when you own a concert grand and one is a piano technician, ones piano should be in good condition, which has lead to all kinds of frustration and anguish.
I’ll go into that later, but I have begun the process of trying to get it into some kind of concert level shape, starting with basic key work. This should go into the Please God, Get A Life category, since this was my Friday night!