Front crudcatcher is almost completely useless by itself. Bender Fender does the job that the crudcatcher fails to do, but for best results get something like a Shockboard- no more ugly than a Crudcatcher, and immensely more effective. Neoguard is another way to do it, but uglier than the Bender Fender and does a good job of directing mud onto your fork legs and seals.
Rear guards are tricky on the back. IMO the Neoguard is much better than the latest Crudcatcher rear with the single bolt fixing- I managed to get one of the new Cruds to work properly and all it took was a soldering iron and a lathe, easy!