I bought these 2 months ago. First night I was on the covers, the left one came off. I was miraculously able to find it on the side of the road. 3 weeks later, the left one came off again, couldn't find it. Scott from Keep on Kovers was very kind to send me a replacement. But 2 weeks later it arrived, left fell off again. 2 weeks after that, the right one came off. No more kovers.
I'm fairly certain that Scott would keep sending replacements, especially since I bought the 4x durability version (most expensive) but I just bought a tube of Shoe Goo instead. While they weren't falling off, my cleats were definitely protected. The aluminium plate looked pristine. If only they stayed on...