I was going to buy the MB210 or MB115 - had tried them with both P and Jazz (I have vintage ones of both models) and the sound was honestly stunningly good - NO dead spots, and all my SWR's and every rack system (remember those? ;-) ) seemed to have a "D" or "F" that fell into a black hole somewhere.
Then I saw the 112 sitting in a corner (I was at a SA store - normally the place I go only for used effects pedals for 6-string, as they price them below cheap eBay prices - especially rare ones they can't figure out!) - I thought "WTH" and plugged in with a Jazz and was floored. I liked it *better* than the big brothers.
The limitations - few controls, no ext speaker out - didn't bother me. Gallien knows his tone from a true engineering standpoint (hence his "reverse" tone stack moving from treble to bass) and nowadays every large venue has a direct-inject line; smaller places this thing will bury. It's loud. REALLY loud. And the gain control (yes, "gain"...not volume. It controls what's going into the entire circuit, NOT what's coming OUT. Unique and it took me a few minutes to grasp the difference in how to work with the tone controls, which change bandwidth as the gain is increased) just keeps going - I could turn it up to a glass-shattering level with a clean but very warm sound. With no token tube.
Plus I have a bad back and just can't handle lugging my old gear around anymore. So I pulled out my iPhone, found an ad for $299, showed it to a sales guy and he matched it on the spot.
What really amazed me is when I got it home I plugged my old Fender pedal steel into it (highly modified, tons of effects...but still...) and it was better than my BF Vibroverb. So I tried it with a Tele - same results. Warm, greasy and it actually broke up with 6-string at reasonable levels like a 40-ish watt tube amp. But with bass - clean city no matter how loud.
As a die-hard tube amp guy when it comes to 6-string I *probably* won't use it that way...but if my back feels like cr*p I might give it a shot. I swear, it weighs FAR less than my pedalboard!
So I sold my Baby Blue. Kept my aged PB-200 just on principal, but away went the cab. I figure if I REALLY need more push I can borrow a cab for the PB-200 and run it and the MB112 in stereo.
I've played most of the combo and smaller head/cab setups in local stores (Mark Bass, Hartke, Ampeg, Fender, Behringer..ech...Line 6, SWR, Orange, Genz Benz trying to find a lightweight amp that wouldn't kill me physically - but I was not going to change if the one wasn't there. These ultralight GK combos, at least for me (I'm a "below the 7th fret" player who does not pop or slap) have the tone in spades and the weight's a lifesaver.