Love Kwikset... have installed all locks with Kwikset Smartkey feature and can change all the locks with a different kwikset key (6 door and 3 zwave) in about 10 minutes:  great feature if you have rentals.  The warranty is second to none and the zwave works with my IRIS system faultlessly- have had a couple of issues and customer service was great in helping solving these issues.  Thank you for a great product line!!!