The best way to enter your home or to have guests and/or repair technicians enter is this keypad deadbolt. 
You will almost never have to use and fumble with a key or worry about dropping the keys in the cold, wet or dark entry way again. 
Letting a guest in doesn't require you to meet them with a key. 
Note it is always good to also keep a key lock box with the keypads deadbolt key In it in case ultra cold temps kill the last of the battery or some sort of malfunction that might rarely occur. I have had this scenario once or twice in 10 plus years. 
I have had these keypad deadbolts on my home door and have installed them in multiple clients home doors for over 10 years now. My clients and I have had zero complaints.