Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worst purchase I've ever made...

This is the all-time worst. It lasted for 3 weeks before it gave out for some unknown reason. iRobot's non-existent customer service couldn't fix the problem. They ordered a new dust bin for the unit, but the dust bins have been on backorder for a month and as of one month ago, they had no idea when the dust bins would be back in-stock. I wholeheartedly agree with those reviewers that have stated that this thing is not ready for prime time.I'll try another one in five years when the technology has improved this little device. Until then, my suggestion is to stay far away.