My daughter got me key pad locks for my doors. I have yet to install them. I have replaced my other locking door knobs a few times in my life, and expect that this will be a little trickier, but I think I can do it. I like the idea of not having to have keys to get in my house.
Most brands are quite easy to install. We have them on all our exterior doors and love them. If the batteries fail you still hav3 the option of using a key