I finally received my batteries yesterday, 2 Panasonic 18659 2250mah, and charged them last night. I did a few vapes, ~10 minutes, once they were ready and enjoyed the gripper's performance, I used the ViVi Nova, Kanger T2 LR, an 808D Carto & Stardust Clearo, with & without a 510 extension.
Though I was worried about the door closure with the battery, it was flush & the Mod sat steady & level on my desk. I like the LCD Display, easy to read, simple to operate, the size of the unit isn't too small and I like the rubberized finish.
It was easy to hold & operate, pinky under the unit and my thumb on the middle grip indentation, middle & ring fingers on the smooth side, index operating the top button. this kept the unit approximately 3-4" away from my palm, in either hand precluding the chance of accidentally changing the voltage while vaping.
This does hit like a beast, most of my vaping was @3.2- 3.5, an occasional 3.0 and at 3.7 it was giving a burnt taste. I did enjoy experimenting with the different voltages and noticing the difference in taste and vapor production. I'm guessing higher voltages would be better suited to resistances 3.5 and above on single coils. I don't know anything about Dual Coils since I haven't tried any.
Overall, even though the construction is plastic, the rubber finish adds to the feel in my hand. The Battery door is the weakest link in its construction, my 510 connector is rock solid and I only tighten till it becomes stiff to the turn, then I add a slight tweak. My top button did have an audible click which didn't bother me since the flavor of my liquids can be fine tuned with a voltage adjustment and I get plumes of vapor.
I had second thoughts about this purchase while waiting for my batteries to arrive, they have been buried by its first performance. While I remember, my only other complaint/ observation was how hot the Carto or Clearo became when doing consecutive vapes, no greater than a 60 second pause between draws.
I'd recommend this as an inexpensive entry to VV vaping.