I just got a MVP 2 & also have a Vamo V2 Stainless.
The Vamo is a year old & have had no problems at all. You can find all kinds of posts about some Vamo problems, plus there's a Vamo thread in here somewhere dedicated to Vamo's. Should be easy to find with the search box.
The Vamo threading is supposedly the weak link. I think it may because they are brass or some soft metal. I haven't had a single issue with mine but I only use it at home & take care of my stuff.
The MVP 2 I just got is a very nice unit. I just got it but as little time I've used it, sure is a solidly built device. I got it for a song during a great sale someone posted on ECF. [Thanks again to whoever posted that].
The MVP feels good & definitely smaller so that's good. The only thing I don't like is the MVP is a disposable device once the battery is done. Guess they want you to just keep buying them?
You'd be happy with either of them. I got my Vamo V2 SS from Fasttech but you have to look for the kit with the Nitecore charger & I think, Panasonic batteries. Don't skimp on chargers & batts. Get the good ones from the start. Never ever get anything with the word fire in it, such as Trustfire, etc. There has been many probs. reported with "Fire" stuff.
Good luck & hope I could help.
BTW, I don't know the differences between the various Vamo #'s out there. When I got the V2 it was the latest & greatest.
JC