Instruct: Classify Amazon reviews into positive or negative sentiment
Query: do not buy! waste of money!

We paid $350 for the 4230 scheduler 14 months ago and this week it completely died. We took good care of it - cleaning the brushes, filters, bins, and even buying a new battery for it because the battery died after 11 months (yes, be aware that the batteries for these things will last maybe a year). Support only offered us a discount on a new roomba because our warranty had expired. I'm not planning on giving any more money to iRobot, and you shouldn't either.