Downtube guards like Cycra and Crudcatchers are pish by themselves… Barely more than pointless. But, add a RRP thing or better a Muckynuts Bender Fender and you get a better result. The Bender Fender is pretty effective just by itself in fact, very highly Northwind Approved. Much better in my experience than the RRP. (you can make your own easily too)
I’d recommend my SKS Shockboard but I’ve broken 2 at the mounting now, they’re just a wee bit too delicate. Still, they ziptie on easily enough. Absolutely superb at stopping mud though and not all that ugly- less ugly I think than a crudcatcher or similiar and massively less ugly than those ridiculous Crud beak things, not to mention more effective, lighter and easier to fit.