I've used a Model M from 1985 for the last 6 years. I don't know how much it had been used before and I've recently started to think that it might have started

I've used a Model M from 1985 for the last 6 years. I don't know how much it had been used before and I've recently started to think that it might have started to wear off. But all that time it has been the best keyboard I've ever used. I'm serious, my typos went down to less than half, instantaneously. The sound does annoy me, though. The cherries I've tried (mechanical keyboards - though I don't know the model names) felt like cheap toys in comparison. I think the inexpensive Dell SK-8115 is much better than those. The Dell has distinctively shaped keys and a solid activation point. Not a mechanical keyboard, though, and probably wears off quicker.