Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Piece of junk

I wanted a pump for occasional use and so I purchased this pump for the job. I thought it would be quick considering it was electric, but boy was I wrong. It doesn't have a speed control, only suction control. It pulls so hard and is very slow in its process.It took me 1/2 an hour to get 1oz of milk! Then to make matters worse when I was finally done, I was so sore it was really hard for me to breastfeed my baby.Of course you can't return an item that is for personal use, so the $39.99 was money down the drain.