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Those are called tactile keyboards and have many advantages (and the disadvantage of being noisy, although this varies by switch type): http://www.overclock.net/t/491752/mechanical-keyboard-guide

I might be a little biased considering I own one, but many people find the click clack sound produced by a keyboard with Cherry MX Blue switches to be quite relaxing.

I find the keyboard sound the hardest to tune out. I think it's the constant change in speed and duration of the typing.