With a tip-speed of 627 attacks I need both flat keys (to avoid unnecessary movements "over" having to make the buttons), and quiet keys. Both met the Microsoft keyboard for me: The keys can be operated quickly and quietly. The "Quiet" effect "faded" but felt after a few month. I particularly like also that the keyboard of size is slightly more compact without sacrificing to learn to use the way - my old Compaq keyboard is almost 10cm longer.
