I also used the Medela electric pump. I can't remember if it was a single or dual, as it was 8 years ago, yikes! I think it was dual but I can't be sure. Gosh, I was a waitress at the time (while I was going to college) and I remember having to pump sitting on the toilet in the nasty breakroom bathroom at work. YUCK! But I do remember that I never felt pain from breastfeeding. As a matter of fact it was the opposite. If I got too full my nipples / breasts would hurt until I either fed the baby or pumped it out. However, I did feel pain from pumping, before I knew you were supposed to use a lubricant / nipple cream!!! Once I did that, the pumping didn't even hurt so much. Oh, and I tried expressing and the hand pump and was a failure at both, lol... I think I finally got the hang of expressing but it took so long and so much effort. I am far too lazy for that. So I used the electric breast pump. I loved it.