This is tough for us too - we were even thinking of buying two iPads connected to their Cloud account, just so whenever they locked themselves out, we could mail them the one we have while they mail us the broken one.
The biggest problem for iPads is every time there's a software update, it asks you to set a keypad password. They set one, thinking they are guessing one they've already set, they don't remember it, and they get locked out every time.
The biggest problem for iPads is every time there's a software update, it asks you to set a keypad password. They set one, thinking they are guessing one they've already set, they don't remember it, and they get locked out every time.