E.M.
Medela all the way. I used one with my first that had two prior users and two more after me (total of three people, all family members), we all pumped while at work full time for at least 6 months (18 months for me) and no problems. With my second, I bought an Ameda and had nothing but problems, had to get the main unit replaced twice, it was a nightmare. Medela is totally worth paying a little out of pocket!