Next summer we'll be going on vacation and have no one that can come out in the morning and at night to open/close. We will have someone that can come during the day to gather eggs and check food/water but not after dark and not early in the am. We don't have any neighbors. So anyway, our best option will be to use an auto door opener. I am paranoid that it could fail and my chickens could be trapped inside or outside the coop so I want to make sure we get the most reliable one. I have until next summer to save up for it so I am not worried too much about cost, just want it to be the best. We have a door that slides up and down in a metal track.