Breast pumps

What are some good breast pumps to use? I've had the ameda purely yours twice because my first one quit working and the 2nd was givin to me. They for me were so uncomfortable!! The suction also wasn't good at all! It wouldn't even let me have any let downs. Anybody have any suggestions? This is my 3rd and I haven't been able to breast feed any of my babies and I really want to!