I've had Guidi baby calf and horse. Wore the calf in rain, ice and snow. Held up great.
Wore my horse backzips to Riot Fest on Sunday and they put up with fields of mud and soggy grass.
Feet stayed dry and they look pretty bad ass dirty with the dry mud, I figured to let it come off on its own.
So from my experience with two types of Guidi leathers I can vouch that they take a good beating.
NicelyNice knows all about that as well, his worn pairs are amazing.