The ability to regulate ones voltage in a mod just doesn't seem that important to me. I have a 3.7v and a 5v boxmod--both from Ken. They are my daily
vaping devices and will remain so--I quit shopping when I acquired the 5v mod. The 3.7v is my vape at work and does just fine with Joye510 LR attys in it. Not a big difference from the 5v when you plug in the LR attys,
I shopped and shopped and thought I'd never stop shopping until I hit this combo. The 5v boxmod is my evening and morning vape--the 3.7 mod is my work vape. My "work" is as a skidder operator in the mountains of the pacific northwest. I shuffle my boxmod in and out of my pocket a a hundred times a day. It takes the dust and other adverse conditions in stride. I wouldn't consider any other pv for
vaping under these conditions. JMO