It was horrible.
Visitor Review: My name is Celeste and I purchased the Medela Single Deluxe Battery/Electric Breast pump when I was nursing my first son. It was horrible.
I could almost never get the thing to work right and when I did actually get it to work it hurt so bad that I did not want to use it.
It was however very reasonably priced compared to the other breast pumps. That may have been the problem.