Tileman; The linners do help the snow from sticking to the moldboard.
And the snow does roll off nicely.
Also can be used to cover up rusted out areas that your plow may have.
If you do plan to use one do yourself a favor and make sure that there's a good primed or painted surface on the face of the plow to help prevent rust for forming between the linner and the moldboard.
Not the easiest to install either so make sure you have quite a few spring clamps and extra screws on hand before you start.