I like using the vype e-pen. I've been using it since February 2015 and not had one cigarette since I started.
I used to smoke 30 a day and had been smoking for 45 years. I feel so much better having quit.
I chose the Vype e-pen because it looked much nicer than the other pens I had looked at, hate the ones that you can see the liquid. Love the feel of it too,