In reply to haydn:
I can't help you on the scratching issue, but can vouch for metal studs on snow and ice.
During winter back home, I use Icebug shoes which have steel studs like the Orocs - the difference between them and my normal shoes is amazing. That said, my girlfriend has some Nike running shoes which have a different rubber compound suited to giving grip in the cold. I'm not sure of the model, but the sports shops in Northern Norway seem to sell a lot of them. These non-studded shoes see to work well for what its worth.
Also, there is a goretex version of the Oroc, this might be an idea if running through cold wet slush...