Spectra 9 Plus

Looking for some feedback on the Spectra

9 Plus. I breastfed my first son for a little over a year and have the Spectra S2 which I used to pump once I went back to work. I’m looking to keep one pump at home and one at work for my second baby and I like the idea of not being tethered to a plug while pumping at work. I know the Spectra S1 is rechargeable but it’s not covered by my insurance. Not sure if I should just get another S2 or try the 9 plus. Any advice would be greatly appreciated!