Sorry for the ignorance but I don't think I've ever used one.. we do have Cherry keyboards at work that may be model M but I'm not too sure and never really thought to look. I just know they are stiff as it gets.. my fingers cry after typing anything.

But then again I grew up in the mushy keyboard era so it's funny how that works. I'm typing this from one of Apple's aluminum ones and I think it's one of the best keyboards I've used :O