Instruct: Classify the given Amazon review as either positive or negative.
Query: Very Frustrating....

I have problems with the pump draining into the bottles. It fills up the chamber and I have to break the suction from my breast and let it run for a while in order for it to drain. Sometimes I even have to stop the pump, completely take it apart and break the valve open for it to drain. I wash/sterilize it as directed and I've tried replacing the valves as well, with the ones provided as extras. I should have saved my $$$ for a Medela pump. The pump works, it just gets very frustrating to have to watch the side of the chamber until it fills up, so that I can stop and drain it.