I am really liking the istick. Using it with my kayfun at 15watts. Used it for an entire day and damn the battery just goes and goes. Now this could be my imagination but it seems to put more power to my kayfun at 15 watts then my Vaporshark rDNA. One thing I did notice is that it won't make a connection to my Taifun GT.. I am sure I could get it to make a connection by screwing the 510 out a little on my taifun but I have learned not to mess with that to avoid leaking. Haven't used it with my Expromizer or Fogger yet but for now I'm a happy vapor using it with my kayfun.. Love the size of it.. Prefect for taking on the go and no worries about if I lose it or not for the price is so cheap. This is a great little item and I would recommend it to anyone. Lowest I have taken it so far is 1.2 ohms.. So can't tell you about how low it goes but whatever.. I am not subbing on the go anyway. Anyway that is my first take on it.. We will see how it holds up but it feels pretty damn solid.