Best advice I can give is to wait. Save a few more bucks and get the Tesla.
tesla
I've had two Vamos. v1 bit the dirt at just three months old. v2 got put in last place after I got my Tesla. Yea it looks wierd, but weighs less than a Vamo with an 18650 in it. Menu is supper easy to use. No confussion about which mode your in. VMS or RMS. It's already programed for RMS mode. Sorry Vamo owners but I am one of you and after I got this everyone with a Vamo wants to use my Tesla. Just my two cents worth. BTW The vamo's I've had would work with button or flat top batteries.
Both units still fire at the 37 hrz cycle. Sorry if I'm wrong but that what I've learned about from ECF members.
http://www.e-cigarette-forum.com/forum/provari/381232-provari-oscope-vs-vamo.html
And no I'm not trying to sell you on the Provari. I've got three and like my Lava tube just as much as every mod I have. They all work and that's fine wih me. I'm not a fanboy of any device except that one that keeps you from smoking.