RE: Beretta Xtrema2
I have the Xtrema 1. It still kicks, there really isn't a magic potion to completely stoping the recoil. I can shoot 100-125 rounds with trap/skeet/sporting clays, and still gets me a little tender.
I haven't shot the newer kick off system, but I would imagine if you focus on the recoil it's going to stand out as having more recoil vs. shooting in the field at game and not noticing the recoil. Slugs always kick harder.