Best thing since the invention of the wheel! I started with the epen, within 2 days my husband was wanting one. Cartridges a little expensive, and I would like to see more deals for frequent customers as with 2 of us using epens we get through a lot. After both of us being a 20 a day smokers we are getting through a lot of cartridges. Product it self EXCELLENT have already recommended to my Mother, who is expecting hers today!