The SureCycle system will reduce felt recoil by about 20% and the reliabilty tune-up will eliminate the springs in the gas pistons, replace the magazine follower and spring, and they will lap the bolt. The gun will run faster and smoother with less recoil.
Or not. I've shot SLPs with a sealed piston and the recoil is not reduced. When we put one on a sled, the recoil actually increased. While it does make the fastest cycle shotgun cycle a little faster, there is no benefit. A Surecycle with heavier loads will wear the gun faster.
The Versa-Max has a different operating system and there is no active piston.