We got this smart key handset doorknob and deadbolt about a month ago and are very pleased. The installation was easy enough for two homeowners with moderate DIY experience to install. Our door required no additional drilling or modifications to install. Removed the old hardware and updated the look of our front door with this set. Love that it has the smart key feature to easily change the key if necessary. Comes in handy when a key is lost. I recommend this product.