I love my 5v passthrough for the heat and flavor, but hate being tethered to the wall for higher volt vaping. I don't like the idea of battery stacking though, so that leaves out several well known inexpensive mods. The provari is just to expensive to justify to the ol' man, and I have heard that the lavatube is unregulated, and the pwr drops as the battery is used. According to Kalamazoo vapers, the KVS tubemod is regulated, accepts IMR 18650 which I already have because of my diamond mod from Parkes. Has anyone owned, or experienced the KVS out there, and what is your opinions?