I have a kick-eez on a rifled slug gun, it works great and was very easy to work on as Wooly said. The one BC30cal mentioned (freezing the pad and wd-40 for lube) would be the limbsaver, which also works great, but it is a little harder to work with. I didn't have to freeze mine or lube it, but I didn't end up with a super smooth finish either. Weight wise, slug gun recoil pad measures 4.650" x 1.625", factory pad (Mossberg) weighs 5oz, Kick-eez weighs 5.5oz. Savage 111F factory pad (4.870" x 1.675") weighs 3 oz, precision fit Limbsaver for the same gun weighs 4.5 oz.
If your willing to sacrifice some pain for weight savings, the Savage hockey puck wins, hands down. You can have mine, just pay the shipping. The limbsavers seem to be the next best for weight, and do not have a metal plate in them like the kick-eez or the decelerator, which probably helps with the weight savings. I also find the Limbsaver a bit softer than the kick-eez, but it also costs around $20 more. I don't have a Decelerator to compare to.
Jim