Just ordered a "Little Sister" variable voltage mod from Ken. His website says up to a 14 day wait on shipping. I really hope it's sooner than that. I really like the idea of adjustable voltage since my 5v box was just a little too much for me. My cartos always had a burnt taste to them at 5v, but not enough vapor and TH at 3v. I'm hoping to find a sweet spot around 4.5v.