I was recently bought the pro tank and epen 3 as a treat from the wife. I have enough vape products to open my own business! I'm particularly pleased with the quality of the pro itself and the vape it produces. Shorter than what I was using it fits perfectly in my top pocket and still has enough battery to last a couple of day of steady vaping every few hours. The epen 3 is plastic and although nice to vape and very light, it is not in the same league as a pro for taste and quantity. Overall pleased with both but I prefer liquid to the cartridges. Although is Vype what to send me some of their new fruit flavours to try I'm more than happy to review them ;-)