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Pros
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.
Pro Keeps milk out of the tubing
This Spectra breast pump has back flow protectors, making it a closed system pump. This prevents your milk from coming in contact with the pump motor to maintain your milk's sterility, and prolongs your pump motor's lifespan.
Pro Great to use for nighttime sessions
The Spectra is one of the quietest electric pumps. It only emits a gentle whirring sound. And since it has a night-light and a backlit digital LCD, it is convenient to use in the dark without waking your baby or partner sleeping nearby.
Cons
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.