Instruct: Classify Amazon reviews into positive or negative sentiment
Query: ZERO stars for ZERO Gravity

We had a very disappointed boy on Christmas Day. I was dubious about this product so I had a back up r/c gift on hand, thank goodness.The zero gravity r/c hummer is a piece of junk. We followed the charging and operating instructions to a T, and it is just an awful, overpriced toy. It does not move AT ALL on even low pile carpet. It did not climb our walls (there is a makeshift ramp included if your walls have baseboards) AT ALL. I took it back the very next day, as I am sure many will be doing. Shame on Air Hogs for selling this junk to kids. Come to think of it, I have never had an air hogs product that worked...