Originally Posted by TwoCables
The Model M is buckling springs over membranes. The membranes are sandwiched between two steel plates which is what gives the keyboard its durability, but it's still membrane-based. Read my HP SK-2505 dissection, I make a few comments on the comparison between it and a Model M.
Originally Posted by yann3804
Will the keyboard feeling be better after washing?
Hard to say. It will certainly feel better as in texture of the case and keycaps. But the springs are what give it its feel. Keep in mind that buckling springs wear out relatively fast compared to other mechanical switches (though the downright failure rate is lower than Alps switches). I can certainly feel the difference on mine, between the very heavily used alphanumerical section and the lighter used F and editing keys. The feel is still quite superb, but you can tell that it's lost some of its tactility.
Keep in mind folks that the Model M isn't necessarily the perfect keyboard. It's simply the "defining" mechanical keyboard and one of the best and oldest that is still compatible with modern computers without an adapter. The Model M is the end of a long series of cost reductions, from the beam spring switch keyboards used on 70's million dollar IBM mainframes, to the capacitive buckling springs of the Model F. The Model M set the standard for layout, and the build quality is superb, but it uses a relatively cheap membrane system, the switches are cheap and chaotic by nature, and the plastic rivets holding the plates together break over time causing the keyboard to lose its feel, and the plate/membrane system is non-serviceable unless you feel like doing a nuts and bolts mod. And starting the year after it was introduced the Model M was gradually cheapened, with slightly lighter plastics and the like.
It's *still* a superb keyboard. 1,000,000 awesome points minus 10,000 awesome points is still 990,000 awesome points. It's just not perfect, as some people get the impression it is.