Husband has stopped since June using Epen 3.
I have tried several times but now on 12 day.
Epen 3 very easy to use, charges quickly. I would recommend you get 2 so you always have one to hand.
Only negative is the cartridges we have both experienced a few dud ones that run out very quickly compared to usual usage . I would say this is best Vype product and I have tried several different capers from Vype and other companies.