Eric & I have become friends. I send a lot of people to him.
I have a 14" x 15" stone that's just right for two free-form loaves of Challah or Italian. I proof them right on the peel with parchment paper and corn meal, and I'm very pleased with the outcome.
Tonight me and DW made a batch of choc chips with red & green M&M's in the new pan. I trimmed a sheet of parchment paper for the bottom, and we made two sheets of 30 cookies on each. It cut the baking time in half from using the old smaller pans.
Tomorrow I have to make 6 loaves of Italian for a spaghetti dinner for 40 adults in the evening. I'll be able to get 4 loaves on the new pan, which will cut baking time by one batch. Saves me at least 30 minutes in the kitchen.