I had my husband install this beautiful and unique deadbolt lock on our front door. It took him about 45 minutes to install and said it was quite simple. The hardware is quite heavy, and seems extremely sturdy and well made. The inside knob turns smoothly with no resistance. We did use the smart key to replace the included keys, not that it was necessary, we just really wanted to try the feature :) It was easy to do, and works perfectly! I feel much safer, and secure with this being installed on my entryway!