Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Underperforms.

I was very disapointed with this product for several reasons: 1) the dustbin is very small 2) the main brush needs to be unscrewed to be cleaned 3) the little side brush is made of a rigid plastic that was about to break after being used only a few hours 4) but the main problem is that this robotic vacuum kept spinning around table legs and bed legs, often 5 or 6 times before getting unstuck, and once even 13 times before I finally turned it off and moved it to another spot. There was obviously something wrong with the software of the unit I purchased.Overall, this seems to me to be a very cheap and unreliable product. I am unable to recommend this product to anyone.