In reply to UKC Gear: I love mine - invested last winter and hold most of my personal bests whil wearing them as, in the right snow conditions, they allow you to run absolutely flat out on terrain where you would normally break an ankle!
The slight movement they have on your foot gives them a very natural feel.
I have a small home made insole of flexible plastic that I slot under my normal insoles to stiffen my light trail shoe if I'm going a long way in them.
Craig