Loved my 150B! But this one is over priced.
I sold mine 3 years ago for $150, and it was mint. Bought it 2 years before that for $100!
It has enough power for most things, unless you're with a loud band. My main band then, was way too loud, with no PA support. Otherwise I would have kept it.
They are supposed to be pretty reliable as well. I didn't have it long enough to know. But a well built solid state amp will be as reliable, if not more-so than its tube counter-part...
For not a whole lot more, try a 370 head. That should cover just about any situation. I would have kept that one as well if I didn't find the Traynor Mono Block II - probably THE best sound of the 70s solid state heads!