As a long-term wearer of Inov-8 mudclaws (270, 272, 300 classic etc), I'm always on the lookout for any shoe that looks to offer any where near as much grip and preferably doesn't fall apart after a couple of 100 miles. I think the lack of a rock plate would put me off the IRocks but the XTRM seem to fit the bill and may be worth a punt as a potential replacement. Has anyone out there got any experience of both shoes and can offer any comparison in terms of fit, grip and longevity?