Kraton is very durable as well as grippy; Cold Steel on several models (Master Hunter, SRK, tanto) and Benchmade (Puukko 200 and Leuko 220) have Kraton grips. Falkniven's Thermorun (F1) is similar but slightly harder and not quite so grippy. I've never worn a knife handle out but generally I'd think most would last as long as the blade, whatever the matrial. An advantage to Kraton is that it stays grippy even in extreme cold and when bloody or greasy. A buddy and I field dressed four caribou up in the Yukon's Tombstone Valley one November at -30 or so and the Kraton grip on my Master Hunter worked great in those conditions.