compared to the awesomeness that was the Extended Keyboard II (second only to the IBM Model M for hands-down best keyboard I've ever used,)

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I would actually say as far as keyswitches gobest to worst)

IBM Model F

IBM Model M

Cherry MX green&blue

generic buckling spring knockoffs

Alps

rubberdome boards

I have had the fortune of not being forced to use some of the worst keyboards out there.. but my old Apple USB keyboards and the one in my AIIc have certainly not worn out gracefully and are horrid to type on.