If I needed to blast my 100w TSL and 4x12 1960 Lead to keep up with a band, then I'm looking at permanent hearing loss, and then a new band. I hardly ever got that thing past volume level 5, and usually only between 3 and 4, even during live performances, and it was mic'd up as well so it didn't need to be.
The whole idea (for me, at least) is to go smaller these days, I don't think massive rigs with mountains of 4x12s are needed anymore unless you're playing an arena. Mic up a polished tone from your nice small amp, and drive it elsewhere.
In my opinion, a SS 150w amp is more than loud enough on its own, and if not, then you're doing it wrong.
Respectfully,
J