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I have both the Masterbuilt mats and some Frogmats. I think I like the Frogmats better. They both work as intended but the seam around the edges that the Masterbuilt ones have collect "stuff" and are a little harder to clean.
I use Frogmats. They work perfectly, clean up easily in the dishwasher, and it seems that NOTHING sticks to them.
Another bonus is they come pre-cut to fit my MES.
Gary