Smart house/ units? Thought?

[Elexis Sims]

A coworker of mine told me before that she use a keyfob to unlock her apartment instead of a actual key. And I remember a few years ago when I was trying to find my first apartment there was a smart home option. So now as I'm starting to change my mind set from renter to investor/landlord i was wondering how much value would that potentially add to a property or is it even worth potential problems tenant could cause/have? 

Thoughts, options, fact I'm all ears.