Well, if you can't TASTE a difference, then what do you care what the power is? That's like saying you want to buy a meter to see how salty your food is, when you can simply shove a bite in your mouth and add more salt.
I'm still not seeing the purpose of VW. Anyway, just yesterday the inventor of the DNA20 chip (or the guy who sells them, not sure) was on this forum defending his product, and he did say that they were working on a newer version. It would be nice to have another American made box device and the DNA20 I've seen are very very cute (and colorful).
So you should get one of those if you love the VW so much. But from the sheer number of people here (ALL of whom have more batteries than just Provari) telling you how amazing the Provari is, maybe you owe it to yourself to find out what you are missing?
If I could buy a meter that tells me the exact salt content of my eggs, and I knew exactly how salty I liked my eggs, I would use it every time I made eggs. That would save me the trouble of shoving a bite in my mouth with an unknown salt content and then adding more salt as I went which would cause me to waste an untold number of bites of eggs before I got them to the salt level that I prefer. The meter would allow me to set the output of my product as opposed to the input, which in turn would eliminate the need to tinker with my salt shaker every time I made eggs.