Do you mean These? If so I've heard good things about SKS fenders, but nothing about any of their other products. Since you have the Commuter 3 with an IGH I think you might be interested in a Hebie Chainglider, especially if you ride your bike in the rain or slop. There is a US distributor called Bikefront and it looks like they may have a Chainglider to fit your application. They also carry Hebie's more traditional type of chainguards.