I have been using the original Kanger Protank and have had no problem. Liked it so much so that I have several of them.I just ordered a Kanger Prpotank II. I thought it would be just as good as the original only improved. Well not the case. I installed one of the coils that it came with and it was D.O.A. No prpoblem I instalkled the other coild and it leaks allover the place. It also has a very tight drag and produces very little vaper. I noticed that the coils it came with are shorter than the coils on my original Protank so I switched to one of those and it now works fine.I had in the past purchased some replacement coils for my original protank and they were the shorter ones also. Is there a problem with the coils marked "protank/evo"?ThanksStu