So I have a test rig I build my mods in before I complete them, and I liked it so much I just lef it in there and am gonna use it, its not the prettiest but works awesome. What i learned about having a vv mod is, yea its great o be able to go from 3.7-6v, but fine tuning to find the "sweet spot" when you find it it makes a world of difference. Its amazing I was vaping a 6v and thought it was great, well I am using a standard 510 @ 4.2v and its the best. You gotta just find the right atty to voltage mix that works best for you and with a vv mod, is alot easier......just my .02!