I was walking by the clearance aisle at Walmart and they had their cheap-o brand on sale for $30. I bought three. My daughter loves hers. She has mostly carpet. Ours does fine on tile and carpet, but it gets confused in some rooms. We have one for tile/hardwood waiting to come down to TV. I expect it will do well. They may not be perfect, but for $30, I'm not complaining.
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