Do not get this pump! It is too expensive to get without knowing if it will be painful for you or not. I do not have trouble with other pumps (like spectra and medela) on their highest vacuum settings, but I could not get the Willow 360 to work for me despite purchasing their many additional accessories to try to get it to work. I even did a session with their LC, which is a nice idea except the only suggestion was to purchase additional items to try to help me, which also did not help.
Also, note that during the few times I did use the pump, the app does record an accurate volume of milk. It was off by as much as 3 ounces for one breast.