DRAMATICALLY better performance than anything else I've used. Very little resistance on the drag, and enough vapor to made me cough because of the unexpected amount. Wonderful innovation.
I did purchase a new battery because I saw someone post about how this system does not work with older batteries. I'm not quite sure what the person meant, as mine connected just fine. It even showed me that my suspicions about the two year old battery going bad was wrong. It still performs great.