I know they are not very popular, and I gave them away to someone who was curious about ecigs: Blu
They are great because:
1- The PCC is the size and feel of your traditional pack of cigarettes (and looks better

)
2- The batts are small giving the same feel as a cigarette. Just a bit heavier (later, she will get sick of the short battery life, but that's later...)
3- The batts are automatic. Lousy for a veteran, great for a beginner.
4- The cartos are OK.
If I hadn't had the Blu, I don't think I would have made the transition to vaping. I had to make my mistakes, and I still think that this one was a good transition.