I put these on my Beta and just rode it once but through a lot of mud and rocky riverbed.. It works pretty good and it's cheap compared to other choices. I'll see how well it lasts but so far it looks like it is pretty durable. The link stays pretty clean in addition to the protection.. nice..
http://www.obielinkguard.com/product-category/beta/
..you can barely see it here at around 56 sec.. for one..
https://www.youtube.com/watch?v=dhWVBQv4CGA