Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't buy it

I have had the same experience as the other reviewers--I bought one right after the Consumer Reports review came out, and it stopped pumping after a short time. I went through 4 or 5 of these, all replaced under warranty. The last time I got two units in the same shipment. When they both stopped working, I gave up. Each time prior to this, the customer service representatives assured me that they had never heard of this problem with the product. I have a large quantity of cleaning pads and fluid laying around taking up shelf space, so today I decided to see if other people had had the same experience as I did, and found these reviews. I wish I had looked earlier.Like others, I'm not confident that the units (when they actually functioned) did any better than other stain removal products.The representatives had to be lying to me when they said they had had no other reports of this problem. This bothers me. Would a class action lawsuit be appropriate?