I use the longe range in my 870 and i have noticed that it did give me a little more range. I did drop a duck out of a high flying flock, probably 40-45 yds up, although it crippled him because i never recovered him and i saw him splash. As far as the reviews on the extended range that people claim to have dropped geese at 60 yds, i don't know, i have never seen that.
hope this helps