I put one on my 870 and it made a big difference with magnum loads. If you have a Remington you could use the new R3. I think that it is also made by Limbsaver and just marketed under Remington.
JRS, What kind of stock do you have on your 870? I was looking at the R3 recoil pad, but its supposed to be for the synthetic remington stocks only. I would like to put a limbsaver pad on my old express wooden stock and need to know if theres anything that will fit. I don't want their slip on or grindable one, just one that fits right out of the package.