Just got my Kanger Protanks from GotVapes. Filled one up with some juice by opening the bottom, making sure to keep it outside the inner tube, and screwing it back together. This is a bottom coil device, and seems to hold about as much as a vivi nova, maybe a little less. The mouthpiece is fixed, but well done and appears to be stainless or at least chromed well. The hit is awesome but more airy than the vivi nova. I like it, less work. I haven't been able to get it to flood or gurgle yet, and it has yet to leak after a few hours. The flavor is so far comparable to the vivi nova. We will see how it holds up, as I am attempting to replace my vivis with something that won't strip the threads or leak. I have no idea how this will perform in the long run, but I report back in a couple weeks.