I got mine and am truly happy with it and my new Ultrafire 18650 batteries. It is a terrific 3.7v vaping combination. I see that Madvapes now has the switch/circuit board on their site for ten bucks, so I'll have to be ordering a spare or two. For those of you who purchased the extended tube, does your tube have a little gap between the head and tube when screwed together? Yes, I know MadVapes said this would occur and some grinding or polishing might be required--I'm certainly not complaining. I just want to know if anyone has ground their tube down to fit flush yet. Was it pretty easy? I'm asking because I'd rather live with the little gap than screw up the threads on my new favorite vaping tool. Any input would be appreciated. I love this pv!