Well, it went just marginally successfully.
Apparently the door lock mechanism parts inside the door are positioned slightly differently than yours, a little lower, because I couldn't get it mounted right up next to the bottom of the locking mechanism. Or maybe my deadbolt is just shorter. When it is fully extended, my deadbolt only engages the throw-bolt on the door lock by about 1/8". I don't think it would deter anyone who put some muscle behind it.
On the other hand, a brick would get you in a whole lot quicker!
Maybe just the sight of both a deadbolt and a padlock will deter the casual, opportunistic thief (or the lazy crackhead). You're right about the ultimate effectiveness of any locking system in a house thats surface area is about 25% glass. Locks will only deter the undetermined.