I've owned both the Acoustic B115 MkII and the Acoustic B410 MkII and I gotta say I agree with OP. And I have always leaned more towards 15s. The B115 was lacking in a lot of substance and sounded real boring brand new. I traded it back into GC for the B410 and it was light years above the tone of the B115. However the B410 was a beast to move, even with casters. I think mine was around 91lbs. I could also never quite coax enough volume out of it to compete with both of the guitards 4x12s. I've since moved on to two Schroeder 15PLs and would never look at any other cabinets.