The Kickoff system works great and so far seems to be very durable. It's a light weight reducer that actually works and doesn't effect the balance of the gun by being butt heavy. The downside of the Kickoff is that if you want/need and adjustable comb on the Field of Sporting models, there isn't any room for the comb cut or the hardware.
I find the blue anodized receiver repulsive and the trigger to be the joke of the industry and even with a trigger job, awful. Otherwise, I like the gun, but greatly prefer the 300 series models. But to add to what the Setterman says, it's really just a spin off of the Xtrema series, complete with ridiculous trigger.
Just my thoughts.....