I have suggested the lavatube 2 people, and they really like it at first and now three are broken and have gone out for repair... 2 of them the buttons kept misfiring and another was droped and the top came right off and the ground wire broke. I really liked it when I first used it as well but be gentle with them you get what you pay for!!...IMO
Maybe I'll just get a Lavatube kit, a Tox kit, a 3 year warranty on both of them that includes dropping and kicking damage, and a Silver or Baby Bullet for when I'm in the mood to run over my PV with a truck. Total cost $237 plus shipping. Then, I'll have 2 18650 sized VV's, one smaller sized VV, and one 18650 or 14500 sized 3.7/6V tube
mod that you can't kill with a sledgehammer.
(For anyone considering a Lavatube or Tox, I recommend getting a Squaretrade 3 year warranty, including accidental and handling damage coverage, for $16. It's cheap
insurance and they really do pay off fast and easy, especially for low dollar items like the Lavatube.)