Originally Posted by shane45

That thing is just one more useless POS that allows twigs and sticks to get caught in. Put one of those on, and you can start worrying about how many spokes you will need to replace every time you get a branch caught in it, as well as how to protect your derailleur.

The best protection is to simply carry a spare derailleur HANGER. Derailleurs seldom break - but the hangers certainly do.