I have 2 Vamos, both over a year old. One has been used heavily and shows no signs of conking out.I've no reason to think it won't last at least another year. While I understand that a cheap mod may not last along time, I know others who have Vamos still working well a year later. Since no actual study has been done with a decent sample size it is speculative to put restrictive time frames on these mods.
Both the Vamo and MVP2 are good mods. In favor of the MVP - size, long lasting battery, silent draw.
On the minus side - can take a while to recharge, battery not removable so have to wait for it to recharge.
Vamo plus side- can use in two different sizes, takes removable batteries, sturdy.
Minus side - is quite long in 18650 mode, can be a bit heavy (tube mods often are).
Both are good - I suggest thinking about where you want to use it - at work, at home, do you need stealthy, etc. I've used a Vamo in 18350 at work a lot, but an MVP2 would be just as good.