I've used the Fast Tracks tooling to make some turnouts in On30. They are by far the smoothest turnouts I've ever seen. Pushing a Bachmann On30 flatcar through one of them by hand, I could not even feel the wheels crossing the frog. Terrific product!
I'm using Fast Tracks switches on an HO switching layout I'm currently building, and I just bought the necessary Fast Tracks tooling to tackle making my own #4 double slip switch.