I just got my first Provari (full size w/ 18650 extender cap) a couple days ago. I got the nautilus aspire as well, but from a different company - so new ring. Like so many- I went through the usual evolution over 2 years - stupid little cig shaped ones, ego, vamo, itaste, ...Ah well. I'm the type that calculates cost on everything, and I figure, most conservatively, it's been worth $2/ day just to have such a consistent vapor. Really is a great little machine, and the battery life seems much much better too. So I figure in 3 months I'm even. Least that's how my frugal mindset works it out... Gotta say though, I think I've lost interest in all the mods and accessories, but I have a newly invigorated interest in e-liquids!!