I own a couple large Shelter Logic sheds, which is one of the name brands. A big tip to make them last is to put an anchor on every footing, even if you have to buy more (you will). Also keeping them under shade if possible will significantly extend the life of the canvas as the sun's UV rays will break it down, no matter how they are treated from the factory. Do not let any snow develop on the roof, even the snow rated units will stretch and break. Expect 2-5 years life out of them.
2017 Escape SE 2.0 Ingot Silver
Ford Spoiler Winglets, Bug Shield, Mud Flaps