As much as I love my Eroll - the tanks are an impertinence. The wear is very high, because they are made of cheap plastic that deforms with use, so that the tank soon loses fluid. If the tank - like its competitors - not silicone so there would be a problem.
One gets the impression that the high wear is intended to secure Joyetech regular income.
For lack of an alternative, however, I will continue to purchase this product for my Eroll (must).