As for me, I put together my own rig -- a Vision Spinner variable voltage battery, a Kanger bottom-feeder tank, and I get my juice at The Vapor Chef.
I'm vaping less nicotine than I used to smoke for the simple reason that I can take a puff or two when I feel the urge. With cigarettes, even the reservation brand was expensive enough that taking a puff or two and then tossing was a waste, and re-lit cigarettes make fresh-lit cigarettes taste like heaven.
As I've mentioned a few posts above, I did a lot of reading before I switched, mainly because I didn't want to jump out of the frying pan and into the fire. The only drawback I saw was that there's a corelation between kids (wee little ones) exposed to vapor and asthma. For that reason, I only vape outdoors at home. I also don't vape in the office because I'm around a lot of sensitive electronics -- when they're already using air conditioners to reduce static discharge, it seems poor sport to vape, y'know?
I smoked for almost 20 years, and I've tried to quit half a dozen times. Failed each time. With vaporizers I switched and never looked back. They turn a deadly addiction into a tasty hobby. It's methadone with flavor.