right back from the PSX days and still going strong today with the PS3, the Dualshock design is a working example of that little expression: "if it ain't broken, don't fix it."
Not too heavy, yet not too light, with smooth handles your palms will adapt to with ease, bearing the instantly recognisible face buttons, comfortable and responsive analog sticks, and vibration function, so you shake with every shot, punch and crash.
if you ask me, the definition of comfortable, with a cool, sleek look and very high quality. Expect it to work without a fault for years - unless you keep "accidentally" dropping it during a particularly frustrating game, of course.