Oh, that part about a better coder was mostly a joke. I find the sound of the keyboard helps me focus on what I'm doing, but that doesn't work for everyone.
But it's a running joke in my office, as I managed to outfit most of my office mates with them. Admittedly, they are all UNIX layout, which I would argue can make you a more efficient coder, if you use emacs or vi.
Also, it's mostly the old UNIX beards that use them. By a logical fallacy, if you use one, you are an old UNIX beard. Hence a better coder. You know, all pigs are green. I'm green, so I must be a pig.