I shoot an 870 in IDPA type competition because of the magazine extension; 9+1 will beat 4+1 every time!
It's also what I grab if something goes bump in the night. My wife will grab her 20 gauge Ithaca if it's needed.
If I'm going hunting, I take one of my 4 Ithaca's; 2 20's and 2 12's all Model 37 Featherlights, depending on what I'm hunting. To me, they are the fastest handling shotguns I've ever shot. I've taken every thing from dove to deer; grouse to geese, snipe to squirrel with three of those guns and they have never let me down while hunting. I had a feeding problem with one once; the one that was mfg. in 1941; and gave the others checkups at the same time. No other problems were found.
I've also been shooting them since I was 15 years old;
that's 34 years ago!
I have outshot Benelli's, Brownings, and 1100's with these ol' warriors. I guess it's like anything else, just make sure you get the right tool for the job!
Gun or gunner?, who can say; but if I'm going hunting this fall, it'll be with an Ithaca
That said, I'm shooting my 870 at our upcomming 3-gun.
I hope all this helped......