The Maxi is a bit shorter and thinner than the SB. When you first get it, it is a little rough, hence Roughstack. I just take a little sandpaper and give it a once over than polish it up. Now it looks like a high grade aluminum MOD. It fits nice in the hand, the switch is basically like the switch you would see on a Chuck, just on the top as to the side. This helps stop pocket firing, which was an issue I had always had with the Chuck. Pound for Pound if you want a 18650 tube mod you can not go wrong with a SB, if you like to add to the collections as so many of us do, get the Roughstack as well. For 3.7V tube mods I do not think you would be disappointed in either.