Hired someone to install the box, after looking at the instructions and determining that it was as cost effective to hire someone as it was to rent the appropriate drill and do it myself.  Once installed, everything is great.  The mail carrier even had positive comments.  After some heavy rains there was a minor amount of water inside the box, but no worse than I had experienced with a standard box.  I don't always get to my mail early in the day, so having it locked gives me an additional sense of security.  Although it isn't theft-proof, it will slow someone down.