I love my buckling keyboards. The two I have are reproductions and key caps are made with cheap plastic instead of the hardened plastic in the original Model M but they still clicks and clacks like the original. Sure it is loud but that's part of its macho charm. Unlike today's sissy keyboards, buckling keyboards kicks and curses back when you push them around.
I wish there was one for the Mac though. The buckling spring actuator patent has expired long time ago so it could happen. I think it could be very profitable too since keyboard enthusiasts like me wouldn't mind spending a few hundred dollars for a well-crafted buckling keyboard. One can last decades if maintained properly.