Instruct: Classify a review into positive or negative sentiment.
Query: Blender problem

I purchased this blender because Consumer Reports rated it the best for making smoothies and ice drinks. Three weeks after I got it, some of the plastic teeth on the bottom of the blade mechanism broke off. It still worked, but I am sure the rest would break off soon. I returned the blender and will look for one with no plastic parts on the important operating mechanisms.