We need to replace our exterior door. It currently has an automatic door opener that is the push button style. We're not very happy with that style- it makes the door difficult to open if you don't use the button. The button is slow. The button is also at toddler level and takes a lot of abuse. I would love to have a "Star Trek" door that just slides open when you walk up to it. If your library has one of these types of doors, please let me know if you like it. What are maintenance costs? What do you do if they stop working? Do they handle wind/snow well? I would love any advice you have to give. Many thanks!