This is a lockset not a deadbolt, so it may not directly apply, but I bought a commericial grade set from Falcon. Seems like a solid unit hopefully it never gets tested.
From the info i have gathered; A good deadbolt is important but just as much so it is important to make sure the door frame is strong and the entire assembly can survive someone attempting to kick the door in. From everything I read, that is one of the easy steps a thief will take to get into your house, since it is quicker than a lock pick and probably still quieter than breaking a window.
If you look at European entry doors, they engage in 3 spots and have a strike plate that is nearly the full length of the door frame.
I asked about the nanz company earlier for a different application, I would like to build a door with a full mortise lock for another spot.