I love my Herron M150 mono amps on my Alons. Never heard them with B&Ws, but have heard the Herrons with Audio Physic Avanti IIIs and Pro Ac Response 3.8s. Outstanding dynamics and bass control, especially when paired with a Herron preamp. I think they just sound like "music"...effortlessly natural.
I've heard the Gamut is synergistic with B&Ws.
I've heard the Gamut is synergistic with B&Ws.