Here we go for the Terrex FAST R GTX, as I have had them for three months now, with several hikes in rain, some heat and various terrain.
-Fit is true to size. I am a 10 1/2, with a mid volume foot. They fit like, well, glove for you foot.
-Lacing system is similar to lots of other brands. They use a little slider thingy so you can dial in the lacing from the toe box to the top. The little button that depresses in order to slide the "laces" does not work very well on mine. A minor annoyance overall.
-Amazing traction, in nearly any condition or surface. It's like magic. Down hill braking is excellent, the sides grip well during class 3/4 scrambling, almost like an approach shoe with randing. Excellent on scree, rock, water rock, you name it. Yes, on really rugged trails, you will feel sharp-edged rocks; but these are basically sneakers on steroids and NOT a mountaineering boot, so that is to be expected. But even though I could feel the sharp rocks and stuff, they didn't bother me at all...even after long days, no bruising or sore feet.
-When I took them out of the box and saw the construction and light weight, I thought they would wear down quickly like my Inov8 360 Para's did. Not so! These are WAY tougher and much better on your feet than those overpriced hunks of junk.
-Ankle support is good for how light this hybrid hiker is. I found myself not worrying about rolling my ankles...they will hold up, even under a load.
Overall, I love this "boot", or super sneaker, whatever it is. I find that I go faster and harder for longer wearing the Terrex. No, this is not a Viagra review, but these Adidas do make me feel younger in that 'special way'. I love them. The start of a beautiful relationship...