Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Research this product before you buy it!

I loved my roomba while it worked, which was only 2 months. Now all it does is go around in circles and then shut off and beep. Go to roombareview.com and research this product. I have found that many other people are experiencing the same problem and have had to replace the machine upwards of four times and each time the same thing happens. There seems to be a design flaw with this product and I seriously recommend that you research it before you spend the money on it.