An automatic door would be great but how would you know if all your chickens got inside when they were supposed to. The door could shut while one was still out, distracted by something. I guess it's good while you are away and a sitter doesn't have to worry about doing a round up.
My door was installed for a full three weeks before I left for vacation and not once did any of the chooks get stuck outside, they were always in long before the door closed at dusk (almost dark). The great thing about the ADOR1 is that it has a feature called "last call" which you can enable - essentially it opens for a few minutes after it has closed the first time for any stragglers that may be left outside.