Kishy, that's right. I'm curious myself, but since the keycaps and the domes are such a custom build for Smartrex, I would assume the "Enhanced Quiet Touch" are the same. After typing on a Model M, I have to say that I think the "tactile bump" of the rubber dome version is at the same point as a bucking-spring Model M, so it's a reasonably good assumption that the "Enhanced Quiet Touch" is the same as the Smartrex.
It's still a cool keyboard!! Black and solid and has colors and a telephonic inverted numeric keypad. Nice!!