Well, since this thread is bumped anyway....

I got a Hebie Chainglider for my folding bike, and it did not work out. It's a classic of German engineering: it fits perfectly if it fits perfectly, but if your bike is in any way different from what the designer considers normal, you're out of luck. So on a folding bike, with small wheels, the chainglider may be much too long. I had to shorten mine. Friction noise was terrible, and now and then something would snag and the whole thing would come off --sometimes in rather spectacular fashion. I stuck with it for about six months, then trashed it.