The Max Box ($85.00 from MaximumVapors) is a 4AA plastic box powered by two 14500 protected batteries that uses a highly efficient EverCool 6-amp buck VV regulator, has a nice large dial on the front for voltage adjustment (no screwdriver necessary), a digital voltage display inside the box, and employs a no-needle "bladder" feed system that holds about 5mls of
juice and is both user-friendly (very easy to squonk) and internally leak-proof.
I have a Luicy Juicy from MaximumVapors (with another on the way)---it's their 3AA box dual-14500 5-volt regulated feeder, but with no voltage display (unnecessary with a 5-volt regulator---you always know what voltage you're getting). Although my two Wooden Phids and little Missy Wetbox are good, the Luicy Juicy has become my favorite go-to bottom feeder.
If I wanted a VV bottom feeder, I'd get The Max Box in a heartbeat. Not to dismiss NotCigs VVPV---that's a wonderful and very sophisticated top-feeder, but it is a bit pricier than I prefer. Not unfairly so, but up there in ProVari Land. Plus, I appreciate that The Max Box has a digital voltage display.
Todd's boxes are hand-built, of course (not factory-machined like the VVPV), but they're clean and solid.
The Max Box by MaximumVapors