The Protank is impressive in that it works from the very first vape. Other reviewed bottom coil clearomizers have not delivered the way the Protank has. Upon filling the tank and connecting it to my Provari, it immediately delivered a very nice amount of vapor, and a cool vape. The flavor production of the Protank is very good as well. Trying various e liquids on this accessory delivered consistency and taste that other bottom coil clearos have yet to offer.Switching flavors upon the tank becoming empty does not leave any remnants of the previous e liquid behind, a few draws and the new flavor appears, and stays. The price of the Protank is reasonable at approximately $20.00, if you shop around I am certain it can be found for less for the more frugal vaper. replacement coils can be found inexpensively as well.I tried to find something about the Protank that I did not like - its build, performance, price - and I was at a loss. The Protank is an accessory which seems to have pushed past the rubber stamp stage of the clearomizer and entered a field of its own.