Honestly I wasn't sure how I'd deal with the variable voltage thing either - I just liked the idea of having options, however, since Ive had it Ive become much braver (lol) and am turning the little screw for each juice to get a 'sweet spot' (a point at which the juice tastes best). Every juice I use now I fiddle with the little 'tuner' to get the best taste (no more burnt or even slightly burnt tastes, no more half hearted flavors) The little screw wont turn unless you turn it so its not like a switch; theres a tiny screwdriver that comes with the Buzz to turn the screw with. Its super easy to do (I'm not great at gadgets so easy is exactly what I wanted) and the screw is recessed so you cant accidently turn it.
The size was the only off-putting thing for me, although now i have it in my hand its not as big of a deal as I thought it would be. I was already looking at getting a GLV2 or the Buzz and all the big battery mods are big because they have to be in order to get the longer usage out of them. This one is about the size of 3 x AA bateries with the atty attached (height wise)
I used to use 2 PT at home and now i dont use anything except the Buzz - I'm really pleased with it, much more pleased than I thought I would be.