Amithlon runs just great. It's staggeringly fast. Obviously any code that hits hardware is going to have some burps, but that's to be expected. I've got absolutely no gripes about Amithlon - actually, I find it a crying shame that development petered away on it, it's terrific. Not terribly easy to set up, but once it works, it's just mind-blowing.
I've had friends pop by and use this machine, only to have them tell me "that's the fastest A1200T I've ever used, WOW!". I've got the machine in an old generic mid tower case that doesn't look much different than your run of the mill A1200 tower conversion case, heh. For the full effect I really should use an original Amiga keyboard and mouse, I suppose.
Even the guys that turn up their noses at commodity hardware and emulation do a double take when I pop the side panel off and they see x86 HW in there