I actually dug out my old Model M last year. Aside from the fact that the rubber.insulation had flaked off the keyboard cord, it still worked perfectly. And it was every bit as good as I remembered it being for typing, and if I replace the cord it will last forever.
There's only one problem with the thing: it's so damn loud. Every damn keypress is accompanied by a loud "POK!" Forget about annoying other people, *I* was annoyed. Years of typing on pretty good Thinkpad "scissor switch" keyboards had accustomed me to a low, pleasant sussuration.
Cherry makes a "brown" switch that is not quite as loud as the classic buckling spring. I have a cheap nixeus keyboard that uses "brown" knock-offs. They're pretty good and not so loud as to be annoying. I wouldn't use this keyboard in public, at a Starbucks or in the library, but it's fine in my home office.