I don't mind paintball since there is a kind of paintball which MUST be thrown NEAR a suspect with unremovable paint. What I am worrying about is non-human aiming it. Now don't get me wrong, computer aim can be very good (see: any military defense weapon) but I doubt the startup isn't cutting corners somewhere.

Edit to add: Maybe a system of confirmation before shooting would also be helpful. Like, when intrusion is detected, the device should confirm whether to shoot or not. But I don't know how it will work at sleep time.