Although I was very happy with my e-pen, it is very limited with its choice of flavours. I have now moved to the Vype e-box and I find it is also great. I have a much wider range of flavours, and I have a lots of control over it. While the power can be adjusted between 4-12 watts I keep mine at 10 watts. I have been a smoker for 35yrs, smoking 25-30 cigarettes per day and I find the e-box very satisfying with the power staying constant each and every time. I would wholeheartedly recommend the e-box. The only downside I can think of is this. We need a suitable case to carry spare atomisers and 10ml fluid bottles, then it would be prefect!