I have a Robbot ZNA50 that I've had for about a month now. The build quality is quite good. But, I did have a minor problem with it where the pin that holds the firing button in place slid out the side. I crimped the end of the pin with a pair of pliers, stuffed it back into the device and no more issues. Quick 2 minute fix. Minor thing really.
So far, the device has worked well. I've popped a battery into it backwards, and thankfully it is protected. The unit wont turn on. I've used 18490's as well as 18650's without any problem.
However, the chip in it, while OK for the first 35% of the battery just tapers off really quick when it falls below that level. The first 20% of the battery is a stellar vape. the next 15% are a good vape. Then it is just ordinary. It's pretty easy to slip in and out new batteries, but still would like the unit to operate a bit better then it does.
There is a firing delay of about a half a second when the unit is cold, or left to sit for more then a minute. While it's not an issue or overly annoying, it is worth noting.
The internal screw (inside the battery compartment) isn't steel as it's not magnetic. Maybe its zinc? I was going to replace it with a brass screw, but zinc is more conductive then brass so I scratched that idea. I would like to find a copper screw for it (M4x10), but I can't find one on the internet. Than again, a copper screw may not be a strong enough metal as this particular screw holds the battery tube attached to the handle. So zinc is probably the best way to go here.
On this unit, the 510 pin is spring loaded. Overall, Im happy with everything else about the unit and use it all the time. But, if I was to do over, I probably would not buy it again. Probably do a Vaporshark or a Hana instead - only because of the chip.
Can anyone comment about it's vape with an Evolve DNA40 chip in it? Maybe I'll pop one in.