Funny this is coming now. I just snapped a steel MKS clip last Friday. Though it lasted 1.5 years, so I am not complaining. I think the MKS steel ones are still the most dureable, plastic second, and aluminum clips at the very bottom. The one beauty about the plastic ones is they don't bend when you don't want them too. The beauty about the steel ones is that you can form them to your foot for that custom feel. The other great thing about the steel ones is that they actually come in sizes that fit my feet. All in all I think toeclips are among the disposable bike parts - like tires, rims, straps, and chains.