I just went to the Android Device Manager site to see what its all about. They located my S5 as of 24 hours ago within 15 meters of my house. From that screen one can ring the device until the battery runs down, lock the device and insert a new password, or totally erase anything on the device.
That means all of us S5 owners can now be located by ATT, Google, Samsung AND the Federal government. This is FANTASTIC.
Customers, who know this, can never really lose their device but they could destroy its usefulness. Plus, there is no need to worry about forgetting the device password.
Jujst a few years ago this would only be mentioned in science fiction.