I've been riding for about 40 years and never rode with knee braces until now. These RS9s seem to be well constructed. They took a few rides to figure out how to fit them properly. But now I don't know how I could have ridden without them. I haven't had any any hard crashes with them yet so I can't say how much protection they offer, but they have an amazing stabilizing effect on your knees. I ride a lot of deep sand whoops here and I'm taking them a gear higher and much more aggressively now. I have about a half dozen rides on these now and they still look new.