I have both the MVPv2 and a VVv3, and I dearly love both. Either is an excellent buy.
Both are variable voltage/variable wattage, both have an ohm checker, both have a puff counter (actually a trigger-press counter) which I suspect most people find only marginally useful, if at all. Both have a pass-through capability, meaning you can use them while charging.
If you don't mind the brick-like form factor (its dimensions are roughly 1-1/2 by 3-1/2 by 3/4 inches) and heavier weight (about 5 ounces) of the MVP, it is IMHO a stellar device -- I get over 20 hours of use before the yellow warning light that the power is starting to run down from a full charge -- and I hit that trigger button 35 to 50 times per hour unless I'm asleep. I actually once saw the red warning light that the battery was almost dead, but that took more effort to achieve than I care to try and repeat.
It also features a power output, allowing you to charge cell phones and such. I don't use the output much -- I use it mostly to charge stick batteries when I'm out and about.
For me the main downside to it is it's less portable than the VV. The size and weight don't really make it shirt-pocketable, though it's fine in a suit jacket inside pocket or windbreaker. I usually carry mine around in an old cell phone case on my belt.
The most consistent gripe folks have about the MVP is the trigger button. It takes much more pressure to do a button press. I don't find that at all distracting. It actually gives me confidence that, like everything else about this structurally sturdy device, it will endure the rigors of an urban day.
I've never owned a car. I walk everywhere I go, or take a bus if it's more than a 3 mile hike, so mobility is important to me. The VV is far more portable. At a touch under 2 ounces, and measuring about 4" long with 1/2" sides, you barely feel it in a shirt pocket. There's no power output for charging, and the battery life is about what you get in an Ego Twist, which for me means a charge will last through much of a morning. Although well tooled, solid, and by no means flimsy, it doesn't feel as sturdy as the MVP. If you shake it, you can hear button rattle. If the MVP was a sports utility vehicle, the VV is a well built sedan.
Both are worth the money I think. When I use the MVP, I'm primarily trading better battery life for somewhat more cumbersome portability. If portability is important, I go for the VV, but I need to anticipate whether I need to bring something else with me because of the shorter battery life. If I had to choose just one, I'd go with the feature-rich, long lasting MVP.
Hope that helps.
