I just recently bought my first one, and so I did a bunch of research only a few months ago that's still relevant today... if I had been able to afford it, I would have gone with the Arizer Air 2. I still plan on buying that one as our second vaporizer, when our budget does allow for it. But to get started, after lots of research, I went with the Boundless CF. It's the less-expensive version of the CFX, and the only real difference is that it doesn't have an electronic screen, and you can't adjust the temperature in 1 degree increments (it just has 5 preset temperatures that are 15 degrees apart).
The Boundless vapes are known for their ability to successfully vape all forms of dry herb, from entire, whole nuggets, to flowers that were crumbled by hand, to flowers that were ground in a grinder. In addition to that, it doesn't require the entire bowl to be filled and/or tamped down in order to vape properly... in other words, it will be successful no matter what form your dry herb is in, and even if you put less in there than is required to fill it up. That trait right there is extremely important for me, because there are times when I don't want to finish a whole bowl, and I also don't want to waste what gets left behind (it's a hybrid convection/conduction vape, so there is convection going on, and that does mean that the herb will still keep heating up for a brief moment even after the vape is powered off). Also, I wanted it to be a vape that I could let my wife or my mother in law use without requiring my help, or a learning curve at all. So Boundless was the winner for me. The CF had all of the features I needed without having to go up to the CFX. It works, too, boy. It's really impressive how well it works with such small amounts. The taste at first was weird, and took some getting used to, but now I don't even want to smoke a bowl anymore because that "toasted" flavor has grown on me and it tastes very pleasant! Also, all the parts are extremely easy to clean, and literally only require soaking in isopropyl alcohol for a short while.
I still plan on getting the Arizer Air 2, which will be MY vaporizer for around the house, and road trips, but then the Boundless can be the one that we take out in public, due to it's visual stealth factor. It looks like a regular old e-cig style box mod.