I've been using the Istick as my work device for a few weeks now and it has been a winner for me for sure. Great form factor and awesome battery life.
That being said, I have had and still have the same issue with the output voltage/wattage vaping hotter than the displayed setting. When I say issue, I mean more of a minor annoyance because at its lowest setting with a 1.5ohm coil which is 3.0v or 6 ish watts it gives me the same vape I've been getting for years on many other devices set to 4.1 ish volts or 10 to 11 watts.with the same 1.5ohm coils.
I have 3 Isticks in the house, two for me and one for the wifey. One was purchased from Eleaf and the other two from another vendor and they all perform exactly the same. So the " your istick is broken, return it" response wont be necessary. Wife vapes hers at 3.0v also BTW.
Some in this thread will see this as a complaint post and somehow be threatened by my findings, but I think it is important for people to give there honest opinion. Only way to know for sure is to try it your self and see if it works for you.