Okay..where to start...
The Smok M80 Plus is an 80 watt box mod with a 12v output, 4000mah (or 4400, both are advertised) internal LiPo battery, "Temperature control" from 200-900F, 0.1ohm limit and on board 2 amp charger with passthrough.
In hand
I was surprised how small it actually is, for a 4000mah (or 4400?) in series box with 80 watts, it is MUCH smaller than something like say the Sigelei 100w. It fits the hand well and is extremely pocketable which makes for a good travel setup for those looking for fairly high wattage and great battery life. It doesnt feel cheap and the buttons are decent albeit with slight rattle (the firing button can be replaced with an included rubber switch). The 510 is spring loaded and all attys I have tried screwed on with no issues, some with very minor gap.
Features and performance
The menu is very easy and quick to navigate, toggling between the three modes (Wattage, Mech, Temperature), Puff plan, Temperature settings and on/off. I have tried a number of different attys and builds and the output is certainly on point which is great news as those who bought the M65 reported it firing weak. It performs great at a legitimate 80 watts which is my preferred wattage on drippers and the Arctic tank. Battery life is stellar for such a small device at this wattage which is one of it's best features. It does offer 2 amp charging so waiting forever between charges is not an issue. If you wish to vape while charging, it offers that as well which the lower wattage models left out.
I built a single .12ohm Ni200 coil on a Kayfun to test it's temperature control. From what I've been able to see, it does not work very well. There is no atomizer setup like the DNA, so no reading new coils and such, you just set the temperature and put it on Temp mode. Even at 200F it was burning cotton despite attempting to regulate. The temperature does climb with resistance changes of the Nickel and does regulate when "reaching" the set temperature however it is clearly much hotter than it's claiming. I have only tried this one build on it, but I have seen a couple reports of similar performance so my hopes are not high that the temperature control works well on this device. Others have claimed their's works fine though so whether it's all of them or just a few is to be seen.
Overall, despite TC not really working, IMO it is a great little device for a cheap price. Right now for $50-55, getting 80 watts in a very small form factor while retaining dual batteries is still a deal to me. Obviously I would prefer a working temperature control and it will be a major turnoff and a deciding factor for some, but for others who want a small lightweight box that is extremely capable, it is still a great choice. For just a few bucks more than a iStick 50w you get a lot more bang for your buck.
I will continue to attempt to get the TC working halfway decent before writing it off as non functional, I will update this with different builds I try and results.