Dude, it may not be a boutique amp, but I guarantee you it's a durable and incredible sounding amplifier. Blackstar does it right, and their stuff is very reliable. I still have a little battery-powered Fly that I bought a few years ago when they first came out, and it's great. I think I paid $30 for it, so that's a heck of an investment. The battery lasts forever, so I can carry it around everywhere. None of those little battery-powered Marshalls, Fenders, or whatever sound remotely as good. You can literally mic that little thing up and record some *relatively* damned good stuff.
I had a Club 50 prior to getting a Series One 50. The Series One stuff is underappreciated because it's awesome. The Club is nearly as good, but the ISF in my opinion sounds better on the Club series than the Series One. For some reason, I can't ever settle on where I want the ISF set on the Series One stuff, and probably the ONLY reason I don't own one anymore.
All this being said, I'd suggest checking to see if the HT-20 is on sale too because that's probably their best sounding amp for the money. It's pretty damned loud as it's loaded with dual EL34's, so don't let the 20 watts fool you. In fact, I was recently torn between getting it and an HT-5, but I opted for the HT-20 so its on the way soon. Highly recommended man. If there are no killer deals on those, or you want more volume, you'll totally do good snagging a Club 50.