Feel free to use it, but read the directions.
I put a book with instructions in a chest next to it. Read it and be sure to return it for the next user. It's pretty simple, actually- you make sure it has fresh water bottles in the double chest on the left side, make sure the brewing stand has 3 fresh bottles. Also check the droppers on top for ingredients!
Then click the ingredients you want, in the order you want them. Be sure to wait a moment after clicking each ingredient to give it time to get through the hoppers to the brewing stand.
Once your potions are done brewing, click the button on the left side, and your potions are dropped into the output chest and fresh bottles are loaded, ready to go.
Currently ingredients are a bit low. I'm going to work on restocking it, but if you have any extra potion ingredients please feel free to drop them off.
Enjoy!