Spectra S9

I’m going back to work next month and I’m a teacher. I plan to pump in my room (pending approval). I have the Spectra S1 and I love it! It works really well for me but it’s large. It’ll be great when I sit at my desk completing work but when I need to get up and walk around I would like something portable. Does anyone have the Spectra S9? How do you like it?