Update: Spencer sez, "Cooking for Engineers has an in-depth review of this:
Each of the brownies from the Baker's Edge did indeed have chewy edges - two of them (and sometimes three) in fact. It was almost like every piece was a corner piece from the standard pan. Therein laid a problem I hadn't considered. I had tasters that liked brownies with edges and tasters that liked brownies that didn't have any chewy edges but were soft and moist throughout. With the regular pan, I had corner pieces, edge pieces, and center pieces (although there are always more than four people who want corner pieces and not enough edge pieces). For the edge lovers, the brownies from the Baker's Edge were perfect - chewy edges surrounding a moist chocolate brownie. For the center lovers, the brownies were good, but they much preferred the texture of the brownies from the 9x13 pan.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.