I don't know if Vortex is made from the same material as the Satos, but I do know of several people that have had good experience with them. Whatever you do, don't get sliders that are metal or Ti, they don't scrub off speed if you lay down your bike. The bike will keep on sliding with sparks, quite a show, but not good. I have the Satos, a little expensive but worth it if you crash.
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