Im sorry, I missed the part where the dimensions of the head where compared to the dimensions of the 1212/6/1. The pictures Ive seen of the 1212/6/1 show the drivers not exactly vertical so the cab itself has to be around 18-20 inches wide (guess). But if your used to the big sound and footprint of a 810, then the 1515/6/1 should still be a lot easier to move!
If one was using a smaller head the 1212/6 is a very big sounding cab. I just wanted something that my 100 pound tube head could sit on safely, and still deliver the sound and volume I wanted.
