Yes, the Tesla can't accept the Kanger T3's, and it can't use 18350 batteries. But if you perform a search on ECF and on google you'll find that the reliability of the Tesla is better than the Zmax, Vamo or Lava tube. I did a lot of research and I've talked to many Tesla owners (who btw, also own Provari's) and they've said the Tesla is very reliable. I've only been able to find 3 that needed to be returned. The other problem was fixed by making sure the spring was set it the proper groove in the end cap. After that there were no more problems.
The Zmax problems are all noted in this thread. Just read through it:
http://www.e-cigarette-forum.com/fo...ic-flat-top-other-reports-one-week-later.html
The Tesla has VV and VW. It can tell you the ohms of your head and the battery life you have left. You can also lock in your settings. Add all of that to better Reliability and it's only reasonable to buy one, unless you don't mind replacing your PV somewhat frequently.
The other mods are good, but I don't want to worry about mine breaking down after the warranty has expired. If I had enough money to replace my PV every few months, I would've bought a Provari and a Tesla.