I have found that I do much better with a manual pump. I've gone through three to find the one that really works for me. The Lansinoh one that I bought was the pits. I tried a Medela that didn't seem to do much at all, but I got an Avent manual pump that just rocks my socks! I got 3 ounces within 30 minutes this morning! That's HUGE for me!
I love my Avent manual too! I have been using my new Medela swing this time but will never get rid of my Avent. It is awesome!