I can tell you too, that you lose the fear of being stared at in no time. It really doesn't happen that often.
The "mini" Lavatubes are shorter than the Twists, and only 1/4" bigger around.
You can get one of the Lavatube minis. Apolloecigs has a 30% off sale with code Vtube30. $50/Alum. $60/Chrome and $73/stainless steel. Those are for the full kits, mini or full sized. You can get the Lavatube only for $39/alum $46/chrome. These are the same chrome ones volcano sells for $100.
BTW. The random firing thing happened in a few of the version 1.5's, so it's not exactly a common error. Apollo has the the original versions, made by a different manufacturer. They're a way better product than any disposable, limited voltage range Twist and the mini is shorter than the 650mah Twist. The Twist will be dead before the warranty runs out on the Lavatube.