I have had my Zeta for 5 days now, and no leaking or auto firing. Don't know or care about the TC because I don't use it. I got the rba with it, and popped a build in it, and I love it. This thing is a solid little device, and its build is just quality. I love these AIO's for their form factor and convenience. They taste and perform just as well as any of my mod and atty kits. Will report back after I've had it a few weeks.
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Been using mine steadily for about 2 weeks. Other than door rattle and lousy TC, it's a good little unit. I also got the RBA - it's small, but if you've dealt with Kayfun style RTAs before, it's not an issue.
I run through 3-4 tanks/day and have had no leaks at all with the 1.0 Ohm coil or the RBA. If course, I don't blow into my device at fired-up like a lot of people do. That could cause condensation build-up inside the chamber.
Using a simple SS316 0.7 coil on the RBA, I could not get TC to be consistent. I would run it from 360-560 F at different times. Doesn't seem to be a way to lock the DCR or adjust TCR. Wattage mode works great with same coil.
Battery cutoff is 3.4V...wish it went to 3.2. I get 3 full tanks using 2500mAH cells with the 1.0 head at 8-9W.
BTW, if you buy an extra tank, it comes with another set of 0.5 and 1.0 coils, so excellent deal.
Overall, very small, easy to fill and change coils, RBA is small but works well, included coils are good, power mode good/TC lousy, no leaking, no misfires, door rattle.