There will be no random out-of-stock products popping up here and there because this great app will take them and carefully place at the bottom of the collection.
Select collections that you want to be swept. Visit settings page and set it up so the app will do the work for you automatically every day.
Keep search engines happy and give them what they want. They won't have to rebuild their index and links value every time your products go away and come back. It takes their time and your money. Keep pages up just don't put them in front of your customers.
If people want something from your store - they will wait for the item to come back. Do not hide out-of-stock items - let "Push Down Out-Of-Stock Items" keep them in a good place until these items are back. The app will put them back where they can be sold and appreciated again.
"I had therefore to remove knowledge, in order to make room for belief." Immanuel Kant