Eric
I bought a Pass X150.8 blind. I had a good amp (ATC P1 - also a dual-mono). The reason I bought it was that Pass have a good reputation and the price was right. It has downsides - very heavy, takes a long time to warm up, and runs hot. Soundwise it has a bit of warmth and that suits my taste. It drives my speakers (Magico A3) with control and the net results are (1) I have easy enjoyment of music (2) the combination does all the audiophile things, eg soundstage. Finally I am happy with its looks - just a little bling with the power meter. Would I ever upgrade? No* because to upgrade it would cost too much and if I had that sort of dosh I would rather upgrade my speakers. Comparison: The ATC P1 uses a module (also mosfets) that are used in professional Active Monitors around the world. A very solid customer indeed and a steal at the price. The Pass is similar sounding but has a bit of something extra - hard to put my finger on it but perhaps a bit more authority / control over the speakers. It has a little higher class A bias. *Never say never so if something fell into my lap at the right price I might go for it.
Andrei