Spectra are having another 20% off sale - they tend to happen once or twice a year.
My wife uses the S1+ with built-in battery and loves it - down to $303.20 from $379.
The S2 is cheaper at $239.20 but requires AC power.
Great time to get extra replacement accessories like shields/flanges.
Don't bother with their bottles - the flanges are compatible with Philips bottles.
We had that S2 to and they are one of the best.