I installed one of these yesterday. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
The installation was very quick. My old door latch was tight and sticky and so was this one so a little work with a Dremel and a file fixed the problem. Everything is tight but smooth now.
I had a little hiccup with programing my pin code but that may have been due to my very bad hearing. I couldn't hear any of the special beeps. I can hear the chime it makes on opening and closing though. I finally just went through all of the steps pretending the beeps were there and I got my code in.
It is very nice getting in or locking it without a key. I'm always leaving keys in the house. There is a manual key override so you won't get locked out. So is it more secure, who knows.