I bought the twisp mini, realised after a week or two that this might actually work, then got a Dura-C, then an NJoy, and a 801 (from China). The Njoy produces by far the best vapour (really, really good!) but the batteries died after a few weeks. I turned one into a manual switch which plugs into my usb port and it works fairly well.
The 801 is almost exactlythe same as the njoy, but one atomiser lasted only a few days. The other is stillgoing strong 3 weeks later. But they're cheap from China, so I plan to order 2 atomisers a month.
The liquid is also really cheap from China - R80 for a 30ml bottle (10ml sells for around R200 locally, with the cheapest being a chap in KZN who sells 10ml for R110).
All in all, I love vaping, and haven't had an analogue in over 6 weeks. Can't stand the smell of a "real" ciggie now.