I personally NEVER like string doors, especially the commercially made and sold. Too many factors that I do not like. The only thing I did like is the fact that they can be put almost anywhere. Well only one till I made my own, on a whim.Like most things, they are reliable until they aren't. A slightly trite response but an honest answer to your question.
I have the standard model from Chicken Guard. I've had it a few months. So far it's worked. I know people who have had this model for longer and so far they've worked.
I think the best approach is to assume at some point it will fail and make arrangements on this assumption. For me the important factor is the coop door opens in the mornings because I can't be there to let the chickens out. I will eventually move the auto door opener to the coop extension which will mean that the chickens can leave the coop but not the extension where I provide food and water.
This is the current arrangement. The auto door opener will be fitted to a door at the end of the coop extension, the part with the white tarpaulin.
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That may be true but I have also heard many stories and read many bad reviews. The main complaint that I read about this specific one and others is when the board goes bad. At $139 having to replace one, is basically having to buy a whole new unit. Read a lot of good reviews, and people like you commenting, also. But it almost feels like a 1 to 1 ratio.I know people who have had this model for longer and so far they've worked.
Are you using it on timer mode or Photocell? If photocell is it doing good under the plastic? Any issues?