Thoughts on new windows and keypad door locks

[Pete T.]

2 seperate questions:

-I have a building that my wife wants to put new windows in.  The current windows are old but work perfectly fine.  The units are all metered so I am trying to understand any advantages of adding new windows besides them being "nice."

-We have a Key code lock on a property that we use as a vacation rental near the beach in Va Bch.  All of the people who have stayed there love it, being able to work to the beach, ifly, golf, stores, etc w/o needing to bring a key.  While this might not work for all properties, I am thinking about using this in other places as it is easy to change the code and people seem to like.  Anything I am missing on this (keypad dies, etc.)?

Feel free to add your own ideas and thanks for the input.