We bought two auto-doors, both from FarmLite - one for the main coop & pen and one for our mini-quarantine coop & pen (where we put ill hens or pullets before intigrating into the main flock).
NO REGRETS whatsoever!
The customer service is excellent - I reached out to them with the first door to get an electronic copy of the manual, so I could just pull it up on my phone when outside adjusting time and I got a copy in my email within hours. Not a big lift on their part but still the swiftness was awesome.
We have 3 twelve week old pullets in the mini-coop right now and it's so nice to be able to sleep in on the weekends!!!