First, I want to say that I don’t drink tap water and I currently have a reverse osmosis system in my house, so this device really made it convenient to store my already filtered water! It’s quick and very easy to use. It has a button that will fill up a cup and stop automatically, there’s another button for a bigger cup (or water bottle), and a button to control exactly how much water you want. 
I also think it’s great that it will tell you if you’re out of water or if the filter needs to be changed. The light is either red or green! And don’t forget to flush the whole container before your first use!