Tony(Fulrac) has these and I run them as well. More of a sacrificial piece of plastic rather than all out protection. I drug my kayak with the full weight on the rear keel of my kayak at the DP boat ramp and it tore a hole through the material. It was fine underneath. I ended up sacrificing a piece from the middle of the hull to replace the torn stuff in the back by heat gunning and removing.
For your typical sand on beach landings it should work well.
http://www.keeleazy.com/