Hi,
Not posted here in a long time, but in the absence of any other responses..
I have a set of these. I got them in the same size as I take in Lowa mountains and they fit, but I guess they do come up slightly smaller as I don't wear them with huge socks.
They appear to be designed as a scrambling boot. The rubber is very high quality/sticky and akin to that which you might find on a rock boot. They are quite flexible and the high rubber rand can be used for smearing if climbing. Just holding them you can see that they will not survive wear that a proper pair of walking boots would, but that's not what they are intended to be. I am told that the army is currently discouraging soldiers from wearing them on Op Herrick. If you want a boot that can handle an approach and a climb/scramble/via ferrata then they may be ideal. They are very lightweight and cool.
A 25km hill run left the soles of my feet battered (back to the lowas), the soles are very thin. I'm keeping them as an approach shoe for climbing.
Hope this helps.