I am trying to decide which of these two breast pumps to buy (was going to delay the purchase until the baby's here ... but travelling to the US soon, and they are much cheaper there than here in Canada, so contemplating buying one). Medela Electric Pumps I will probably stay at home with the baby full-time for the first 4-5 months, will start daycare part-time then (if I could get in) and will return to work full-time once s/he is 7 months. Do I need the more advanced one? Or will I get away with Swing? (There is a huge price difference). How long should I expect to breastfeed anyway? I guess, one of the main differences is that with Pump in Style I could do two breasts at a time, and with Swing -- only one. I can't tell whether pumping both at the same time would even be something useful for me or not .... Thank you!!!