I went through two OEM twists and a T in about 2 months. One of the twists and the T were my fault, I carry in my pants pocket most of the time and snapped the end piece off. The other twist just stopped charging after a couple of weeks.
Didn't want to pony up the cash at the time for a Provari, so I now use a Provape 1 (unregulated, but
batteries are easily switched and cheap, plus the
device has a lifetime warrantly) and an Innokin MVP, which I am really enjoying. Miss the size of the Ego's at times, but am very happy with the
devices I have now. I am sure I will pick up a few Ego's soon, for some reason, I really liked the T2's on them more than my current devices.