Spectra S2 Pump

I was wondering if anyone had reviews on this pump. I've done a lot of research and am pretty set on it. The only negative is it doesn't have a battery adapter so has to be plugged in. I don't think this would be a problem and plan to get a car adaptor with it, but has anyone encountered a problem with that? My insurance covers the S2 or I can upgrade to the S1 which does have battery adaptor for $100, but would rather not unless it'd actually be useful. I plan to only pump when I go back to work part time and for freezer storage. Also what bottles can be used with this pump beside the spectra (tomee tipee, etc)? Thanks!!