I'll wager you ARE getting leaks, but you haven't noticed how it's happening, and that's why you are changing tanks so fast... Allow me to explain:
I have the bauway version of these, which are the same, except there's no hole at the top of the atty to allow the use of an auto batt. What I noticed happening, is the juice gets sucked in through the air channels and pools at the bottom of the mouthpiece, but it won't leak out the air hole in to your mouth.
I was changing my tanks quickly too...If you have a translucent tank, take a look at it after you've taken several hits off it, and you'll see what I mean if you look closely. I found a way to minimize the effect, but you will still get some minor leakage and wasted liquid.
First, when you insert a new tank, push it all the way in, then give it a a little twist. I find it helps create a better seal around the needle and the tank lid. Then, make sure you hold down that button for a few seconds to heat up the coil BEFORE you take a draw. This way, any juice passing through the atty will be vaporized, and very little of it will come through the air channels. It should really help you conserve your juice.
I'm still on the fence, although the love the tighter draw, and flavour/vapor production. Feels more like a cigarette draw. I may go back to smart carts though. They pretty much don't leak at all.
