how can an amplifier sound great when you got buzzing going?
it can’t. However, a properly working unit may sound really good. Don’t know how it stands up to the newest SimAudio.
For 50 large I would pick up a used Boulder 2160 though.
As to SimAudio, I had Moon 330A in my system and it was a really nice amp.
I wouldn’t hesitate to try the new 861 based on my experience with 330A.