It's a wonderful idea in theory, especially for people who do a lot of riding on roads or concrete, but I share the same concerns as Allie. They cannot be bent to provide support or correction where the individual horse needs it, it would basically be the same as a farrier taking a metal shoe out of the box, nailing it on, and rasping the hoof to fit. And after watching their slide show, it shows. There are many horses pictured there that have a significant amount of 'shoe' hanging out past the side of their hoof or behind it (a perfect place to get stepped on by a hind foot and pulled off) and a couple who appear to be wearing shoes that are too small for their foot.