I was only single pumping for several months - it wasn't an issue until it got to the point where I would be pumping for 45 minutes in the middle of the night (on top of a baby who stopped sleeping through the night). This makes pumping much easier and faster. Trying to juggle 2 bottles with one hand is not very easy. With this product, you can just insert the shields, attach the bottles and go. You can even do things around the house if you have a backpack style pump. I would recommend this to a friend!