Bill, I think the "installation of a matted rib" mentioned on Simmons' website would be of little interest if they finished the top in the standard lengthwise grooves. I have to think they are somehow doing the Winchester matting pattern. Someone did post that they had heard a rumor that Simmons was looking at Andy's machine. I guess someone will have to ask for particulars. I, personally, would rather have a solid rib finished smooth on the top than to have one that has the Simmons grooves.