I have a plastic (very good quality) potato ricer with three choices of disc (these are metal).
I have no idea what I did without it. Mashed potatoes are a dream, and it is terribly easy to use and to clean. Riced potatoes do hold more gravy, and they are smoother, so good for incorporating into dishes, or piping decoratively for toppings (e.g. fish pie, snobby cottage or shepherd's pie)