One of the devices I like with the Zwave system is the integrated electronic deadbolt. We already had a digital deadbolt on the back door (although it lacks the Zwave integration) for if and when we forgot our keys or accidentally locked ourselves out (definately beats a key hidden under the mat or on the top of the door frame).
We went with the Smartcode Deadbolt with Zwave for key consistency and asthetics. The ability to program access codes from my laptop instead of while standing at the front door with a user manual in my hand is an added bonus.
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