I had the rear brake bridge carrier on my SKS fenders/mudguards break a while back, apparently from fatigue. It gouged a hole in my nice Panaracer Pasela 26 x 1.75" tire, ruining the tire. Lots of dirt roads on my Tuscany tour the previous spring may have been the culprit, or maybe I goofed somehow when installing the fenders. These were P65 fenders/mudguards, the widest and heaviest ones SKS makes,which may have something to do with it.
I now have a threaded boss in the brake bridge running perpendicular to the brake bolt hole, and I've drilled a hole in the fender and bolted it straight to the brake bridge. We'll see how that works.
For my money, Gilles Berthoud stainless steel fenders with aluminum stays are of distinctly higher quality than SKS fenders. Had I been able to find a wide enough pair for my 26 x 1.75" tires I would have installed them instead of the SKS I now have.
My candidate for "Rolls Royce of mudguards/fenders" would be the carbon fiber Gilles Berthoud model, as seen
here(scroll down).