I did. Vaping was working, but I didn't like the consistency of the Ctwist. Wasn't reliable. The plan is to quit, but it'll be nice to have a good vape now and again.
First off the consistency problem has nothing to do with the EgoTwist or the Provari. They are simply a power source. The carto is the problem and they don't know if you're getting 4 volts from a $20 device or a $200 device.
Cartos are a outdated system. They were never designed to be refilled let alone put in a tank. The quality control on some brands may be a bit better than others but in general cartos just suk balls. Sadly every 5 pack may have a really good one that keeps people buying them but most of the time 3 out of 5 are crap right out of the box.
Nothing is perfect. You just need to figure out what is more important to you personally. If you want the best flavor and performance then you should use a dripping atomizer. If you want the convenience of a larger capacity tank then a bottom coil Protank or Evod from Kanger is currently the best choice. The smart move would be to have both for different circumstances.