plus you can only get in during posted hours (legally). And if you're looking for a place to keep out the "roving bandits", be aware that this same security will keep you out. Mini-storage lockers are not like your or your friends house where you can drop by anytime or in any situation to pick up your stuff.

In a real emergency these places will shut down the same as any other business. To get to your stuff, breaking in would need to be part of your plan.

A note about the u-haul ministorage, they require two locks. One, which they provide and keep the key to, and one you provide, and you keep the key. To get to your locker you need to sign in and get the key from an attendant. I don't know if it's the same everywhere, but the one I used had the smaller room storage inside of a building.