Sorry if this has been repied to before.
VV3 is a great device, it is not an all day device for me. It has a lot of features for an ego sized device. it does not have that hard of a hit when charging so theoretically you could use the USB port on a computer but I never have. Charge lasts me about 3 hours if I am where I can vape. It does everything it is supposed to very well it just does not have enough power to be a serious contender for me.
MVP2 is a stellar performer, full featured and every thing it says on the box it does well. I have even used it to charge my VV3. I use it almost as much as I do my Provaris.
MVP2 and Provari go with me to work every day.
VV3 goes with if I have a training or need to stealth, it also comes along when me and the wife go out. Sometimes my MVP2 or Provari come. I tend to not vape in public where you aren't supposed to smoke and really do not care what people think
I mostly use the VV3 for dry burning coils or testing flavors at home with the little 510 atties.