Pro Can closely mimic your baby's nursing style
The Spectra S1 is more customizable than its competitors. It has separate controls for vacuum (suction strength) and cycle (suction frequency). They are easily adjustable to imitate your baby's own nursing pattern. It also remembers your settings between sessions so you won't have to toggle the controls when you start pumping.
Con Settings don't revert to Level 1 when starting
Since it saves your last session's settings, it starts at the same suction level of your last pumping session. If you ended at Level 11 which is the maximum, it will start pumping at Level 11 when you next use it. That may be surprising for some moms who are expecting a soft massage mode at first.