Hahah, just found this thread through random searches on the site... sorry to re-zombify it...
Those G4/G5 Apple boards were so terrible... The sound of the keys is what really got to me. It was the cheap, somehow altogether "wrong" sound of the hollow, disappointing *tock tock* that they had.
Also, a coworker has some old Sun Type 6 boards. While their layout is awesome, what with extra keys, Ctrl Key in the right spot, etc, their rubber dome build is a whole new level of extra special mush. I remarked to him one day "it's like your typing in pudding!" A while later, he came by my desk, and saw the Model M there, clacking away. He said, "I like typing in pudding, and you like typing in gravel, so we're good!"
:-D