Finally received mine today along with my Provari...woo hoo! Unfortunately, the VV Box mod is DOA! Ugh! I opened another ticket asking for store credit instead.
I haven't done a review of the VV mod on their site yet because I wanted to use it for a while before commenting. One thing I've found out already though is that you don't want to vape this thing hard. One of the components gets really hot and has actually melted the box a little bit on the side between the atty connector and the button. So far it hasn't affected anything other than cosmetics.
It does work good other than that and I've tried it with 1.7 ohm and 3.0 ohm atty's. I used a multimeter to measure each atty and an Ohm's law calculator to figure out what voltage will give me about 8 amps. Then I used the multimeter to set voltage. I can see where the voltage indicator Madvapes sells would be really useful here.