I have the Vamo and really like it. I also picked up the KSD(new) off of Ebay for $40, and it is a nifty device. It functions exactly the same as the ZMax with a single button. Eventually, I will hope to receive my SVD from Fasttech; it has shipped, but I could be waiting another month before it gets here.
The MVP may not be a bad unit, but anything without a replaceable battery gets disqualified. I move around too much for work, and while 2600 mAh may seem like a lot, it really isn't if you are a chain vaper. And while I really love my cars, the power to the cigarette lighter gets cut off when you pull the key. So, I would have to have two in rotation, maybe three (two with me and one always on a charger in my hotel or home). Batteries are a lot cheaper.
One thing about the Vamo, it will not work with protected batteries which I have stopped using anyway.
As far as the Vaporizer is concerned, I have become a bottom coil guy. They are easy to maintain, rebuildable, and give the cooler vape I like. Kanger, Itaste, Smoktech all make them. They do gurgle a bit, but with some slight modding that problem can be overcome.
There are so many good choices and combinations available now that there is no right or wrong in the vaping world. You just have to find what suits your lifestyle and taste.