I've been a believer in the Decellerator for a while. My O/U sports one, and it works well. However, when Kolar tweaked my wife's Beretta, they added a Kick-Eez Rocker. After a bit of messing around with both of them, I really like the Kick-Eez product.
My next shotgun project is going to be cutting down the synthetic stock on a Winchester Defender and installing a Kick-Eez pad. The factory "pad" on that gun is horrible. The shape and lack of "give" seems to increase the amount of felt recoil. I find the hard-plastic butt-plates on my Model 12s and A-5 to be way more comfortable than that USRAC POS. I figure a 13" LOP with the Rocker should be just right.