part of PP's problems with the Yeti were related to him being quite generously sized (and it being flexy).
Oi! 14.5 stone, so not as big as some!
I should have had the alloy rear end. I was seduced by a bling carbon upgrade for £50, when there were already reports of it not being as stiff as the alloy. My own fault mostly.
I said at the time, and I still do, that the Yeti 575 was the most 'fickle' bike I've ever ridden. The tiniest change in set up had a marked effect on the ride. Air pressures, tyres, stems, that sort of thing. A faffers delight really. By the time I sold it, it was running as well as it was ever going to TBH. Up to 90% it was fine, but then I'd press on a bit and the back end went all vague and soggy in fast corners. Not what you need really. I did get my money's worth out of it though.
But on going back to a true 4-bar bike I did notice it was better in other ways too.