I have the Medela Swing electric pump and ABSOLUTELY LOVE IT!!! My daughter was only born 4lb 5 oz so I had to express a lot (and still do) as she was not srong enough to feed entirely from the breast - I express at least 2 - 4 times per day and it is not painful at all - it's a little exy and retails around $300 but I picked mine up at chemist warehouse for $250 but sooooo worth the $$$ I initially hired the medela from the chemist but at $80 per month to hire I figured I would be better off just buying one! - The pump is really small, and can be battery powered or plugged in!!