I was of the understanding that these were primarily mountaineering boots, used in snow. Unless I am mistaken there is no flex in the upper, which is fine in snow, because snow gives, and you can dig your heel or toe in on descents and ascents. The ones I have seen also have a forward cant, which would seem to be murder on the knees on hard flat ground and descents. Am I missing something?
If your a size 9, I have a set of leather upper mountaineering boots in near new condition. I've used them in hard surfaces a few times and they are probably better than plastic, but the stiff sole has similar issues in that your foot does not flex as in a normal boot. I wouldn't trade my PACs, hiker, or rubber boots for them for hunting.