This is an excellent lock.  Bought this lock last Dec 2015, the Gen A who build our house installed it in April 2016 but did not change any of the preset codes.  He told me he had programmed 1234 as my unique code, Do not trust your installer, verify after install that the codes have actually been changed!  Unfortunately it malfunctioned last Sunday and the deadbolt wouldn't retract - it was under constant load by the spring and the door remained locked at all times.  I called tech support and spoke to Paul (incident ticket # 201610735917) and he had me fixed in less than 5 min's.  He went the extra mile and helped me reset my user codes and master codes.