I ordered one last week, it arrived on Tues, and I installed it Weds evening. I now finally have heat in the garage after 16 years. Why did I wait so long.
My biggest concern would be safety... That's a huge heavy door in motion without anyone supervising... If any kids, animals, etc were around I would be concerned something would happen.
I can understand a concern regarding safety if there are small kids around. In my case I have teenagers and...
I installed one over a year ago because swmbfo and the kids were always leaving the garage open. Absolutely love it.
Just be careful if you have a vehicle hafway in ther garage. I can lock it out at the manual console of the door opener or reach up and turn it off easily.