The Forma Adventures come in both high and low versions. I'm running the low ones. Their sizing guide was accurate for the length of my foot, but the toe box was very roomy. I added a reasonably thick insole and it solved the problem. The upper is essentially all leather, so they have been totally waterproof for me so far, but they can get a bit sweaty in the summer.
There was a thread a while back about someone on eBay liquidating a bunch of grey special order ones (Forma doesn't normally offer them in grey) for a really good price. They appear to be legit based the stories of those that have ordered them. I was tempted to order another pair just so I wouldn't have to pay full price if these ever wear out.
They are comfortable enough to hike around in if you don't go crazy. For example, when visiting National Parks and one must hike from the parking lot to the overlook. I think Bridges NP was at least a mile or so hike each way to some of them... but don't quote me on that.
Also, since the uppers are actual leather and they whip through the air at amazing speeds while astride my Vee2, they can dry out faster than a normal service hiking or hunting boot. So be sure to treat / moisturize the leather more often to keep them soft and flexible.
One last thing... when I started using the boots, I found that it was nearly impossible for my giant clown feet to operate the shifter. AdventureTech offers a fantastic controls repositioning kit if you find yourself in that same situation with whatever boots you get.