I have a Medela mini electric which has been great. My little girl is 2 and 1/2 weeks old and I was expressing milk using the pump to express for her. It was able to get out 50-80mls after just 5 minutes on each breast, and that was just one day after my milk came in, but that would obvioulsly depend on your boobs.
I have just stopped expressing for my girl, she is now on formula as she is a lazy sucker, kept detaching every few seconds and will not take it from my breast and I didnt want to express every feed for her, for the next 6 months.
The pump was great, easy to assemble, clean and use can be battery or mains power and has variable suction to make it comfortable for you. It was really useful at the start when my milk came in to help me build up my supply. If you will be using it a lot or you have carpal tunnel like me and cant use a manual pump I highly recommend the electric. Although I wont be using it now, I will keep it for use with my next baby. Just for piece of mind in being able to express and know exactly how much milk you were producing it was worth every cent.
I hope this helps you.....
Min, NSW, Charlotte 30/8/05