I have a plastic one. Nice for absolutely zero maintenance, but you can't have any shelves on the walls. It heats up enough on the inside that the plastic gets soft and screws pull out. I have some metal shelving now. Mine is an 8x10 or 12 and it fits a ton of shit in it. Mower, blower, trimmers, and all of my patio furniture in the winter. In my opinion you can't go wrong with it. And I only paid $25 for mine brand new in the box and poured my own pad for another $75$. Not a bad $100 investment.