Sure Cycle systems work well, however, like DeWayne indicated proper maintenance of your gun eliminates the need for it under most situations. But it's not the simple action and gas system cleaning that most people do, from time to time. It involves regular removal of the butt stock, cleaning and oiling (with the proper oil) the recoil system in the stock. Very few people do this and between rust and powder residue which finds it's way there, eventually it can slow down or even jam up the gun's action.
So, you have your choice, (1) You can clean the spring assembly regularly and properly. (2) You can replace the system with a stainless steel Sure Cycle system, or (3) You can ignore it and hope it doesn't screw up on you in the marsh or on an out of state hunting trip.