I'm least offended by the door bell type devices. They are on the outside and offer no more information than someone could gain by snooping at my house from the street. The benefits of being able to pretend to be present at home when the doorbell is answered is significantly better security of my personal goods against casual burglary. The downside is someone could remotely harvest a profile and recordings of who enters and leaves my house, which can be viewed from the street and offers me no tangible loss of personal privacy over what someone who wanted to watch me could already do.