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The Model M uses buckling springs. Rubber domes are the cheap keyboards you get for $10.

Not quite, the 'Model M' actually refers to a collection of keyboards, some of which used rubber domes (see column 2 of [1] for a quick reference)

Interesting. I have a few IBM non-buckling-spring keyboards, but didn't realize they might also fall under the "Model M" designation.

They're like the Klingons from TOS -- we just don't talk about them.