Let me 1st start off by saying I LOVE MY PROVARI !! And will ALWAYS have and use it till it just wont fire anymore. I have the V1 & V2(blue led) both standard size with AW IMR 2000maH 18650's inside ONLY. I've had the Darwin,well for a week anyway. I sold it 5 days after getting it in flawless condition for $90 bucks less than I paid for it for 2 reasons, it just didn't impress me really,I honestly could NOT justify the high price for what I got for it. Well made,yes...sturdy feel,yes...crappy connection setup,absolutely. Secondly, it just didn't perform the way I was hoping with ALL the hipe that surrounded it. Let me add because of my background I can find flaws in ANYTHING,its just how Im wired and programmed. But having both units at my disposal,sorry but me personally,I'll take my "vari". Being a IT grad with a electrical engineering degree Ive seen the inside of A LOT of our technology we all use day to day. And let me reiterate, I LOVE MY PROVARI" ! While the "vari" was made(or assembled) in the USA keep in mind that 85% of whats inside is probably China made chip-sets and parts. Now being my career choice is what it is, all the laptops, PC's, cell phones, PDA's, pads,etc... most of what I've seen and repaired have China parts inside running them. From my experience,China makes some of the best chip-sets in the world. The Panasonic battery cell is the best money can buy. Sanyos aren't too bad either. If I'm not mistaken,the AW batteries we all love and use have Panasonic Lithium Ion cells inside. I'm a born and bred American and proud to be,but I also believe in giving credit where its due. I've had 14 cars so far,domestic and foreign,I have to be honest and say, the best cars I've owned and personally worked on were absolutely imports. Sorry but it is my 'opinion' . But I will ALWAYS LOVE the American classics. Provari so far to me is hands down the best device out there for the money for sure. And I have to say now that I have this VMAX, its definitely a contender. I really like it so far,it's a true powerhouse,and all the tests I've ran it thru so far are showing its got plenty of very accurate power and PLENTY to spare. And even more safety features to keep it safe and stable. I'm impressed. I know this post may erk a few people but it was not my intention at all,just wanted to give you guys a different perspective on the matter from someone who deals with the internals of all the gadgets we use day to day and some of us couldn't live or function without. Take care everyone and love the PV you do have,but appreciate the PV everyone else might have. Were all here for the same ending goal.....to live.