I have been using the E-Pen, and it O.K, but it is a bit fiddly with green light to turn it on and then the white light to actually vape, and then it turns itself off and then again it is press button 3 times to get green light to turn it back on, etc etc. It would be better if it just turned on and STAYED on until you decided to turn it off. Also VYPE seem to be always changing the flavours, so that when you find one that you like, it is then discontinued. It would be better if VYPE developed a range of flavours and across the board nicotine strengths and stuck to them on a permanent basis.