I too, am truly old-school. Most of the cookies I bake have butter so I rarely grease the sheets or use parchment ($$$$). I bake a ton of cookies (usually in cool weather--Christmas). I have the KAF square sheet (3 years), 1 old (10+ yrs) half sheet its mate, a slightly smaller sheet. These three have aged to a golden patina (butter cookie residue). Two new half sheets (shiny) which I have only used once with Silpat (meh). I did have the air-bake sheets which worked well (they were time-forgiving), until my husband used them for baking fish (ruined!). My parchment exception is "The Joy of Cooking's" "Cocoa Kisses" (meringues), for which I use parchment (2-3 times before replacing). I will try them using Silpat this December.

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