I'd recommend the MVP2, yeah it's not a battery replaceable device, however at $39 online he could buy two of them and have a faux replaceable battery. However, for my lifestyle, I've found that I'm almost always either... In front of a computer that I can plug the MVP2 into the USB slot, or I'm in the car where I use a USB cigarette /Power outlet device (about $5.00 at most electronic stores) that I can plug my MVP2 into, or I'm somewhere close to a wall outlet to plug in my MVP2 and can vape on it while it's plugged into any of the above 3 options.
It may sound silly, but I have actually used it to charge my phone when we were at the beach and the phone battery ran out, and although I would think the majority of people will never use that, it is handy when you do need it for one reason or another, of course some folks may decide it's more important to keep the vaping device going and let the phone sit with the dead battery lol and I'd have to imagine that not everybody carries around a charge cable with them (although I have about 9 of them from my Logitech mice that I've bought over the years, so I've got a couple in the truck, 2 or so in my backpack, and used to keep a couple at the office when I used to have a job in an office, so I almost always had a USB charging cable handy). I'm pretty sure I'd rather carry around a cable than a battery in my pocket, especially when my pocket might be full of change but that might just be me.
But hey, if the guy's got money to burn and the price of the Provari doesn't bother him then let him go for it, if I had money to burn I'd have a Provari or three sitting on my desk.