I have several 870's, wingmaster and express. My first express bought in 1988 still goes with me most of the time. I taped the metal with No-Mar tape the night I bought it and it still wears about 2/3 of the original tape. Some paint was shot on a few areas also. Ducks all over the south, bears in canada, deer in Iowa, turkeys, ducks, doves,rabbits, deer and hogs in georgia. Its a lot smoother now after years of use, but has required no special care. I just spray a little rem oil or equivalent in it, wipe it down and go. After all I have put it through, I couldn't complain if it fell apart tomorrow.
Current production, only a benelli really measures up, and they don't fit me well.