I got mine from Nhaler. I have to admit, the first one I used, I didn't like. With the benefit of hindsight from my vast wealth of four weeks experience, I believe I had underfilled it. In addition, it got HOT!! So the next time, I made sure I put a lot of juice in it (I think it will hold about 1.5-2 mL, and this was just a regular, not one of the megas). I wasn't obsessive about refilling it, but with any slight perception in change of change of taste, I put more fluid in because the higher voltage does seem to go through fluid faster than at standard eGo/RiVa power. In addition, I kept the soft white top off and used one of the plastic drip tips, and it was perfect.