I saw them to, my thought was they may be good if you had other rocker guards with it. I have C4x4 square tube ones, they are tough, but I do have two small dents from the mounts where they barely touch.
Also the ebay specials do not porvide any door protection, I wish the C4x4's stuck out a little more. I woundn't waste your money on them, you could do that same thing with a cheap piece of angle later on your own.