Seriously? That crack proves the point! Large glass holds massive internal stress, and skimping on cool time is begging for disaster. My buddy ruined a twenty-pound vase by pulling it from the kiln too fast. Proper annealing isn't just being careful, it's basic physics to prevent cracks.

Did you look into how thick the vinyl walls are on the models you're checking out? I remember @mark_thompson talking about never painting again, which is huge, but I've heard some cheaper vinyl can get brittle in super cold winters or warp if it's a really thin grade. What specs are you aiming for to make sure this one lasts way longer than the old wood shed?