Buying a breast pump is expensive. Also there isn’t lots of good comparison information out there. I just learned about a website that is trying to fix that: http://www.breastpumpcomparisons.com/. If you’re thinking about buying a pump this could be a good starting point – they have reviews as well as manufacturer’s information. If you already have a pump, it would be great if you submitted a review so that they have more data for other mothers to work from!