Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Substandard Quality

I've owned this for 18 months. It performed well for the first 16 months. Then the 'on' button would not work unless there was constant pressure on it; i.e. you have to hold it down all of the time. Today, two of the clips that lock the bowl in place broke off. The processor has only had moderate use and certainly not any heavy-duty chopping or shredding. I researched food processors thoroughly before I purchased and believed this to be the best buy. I am really disappointed in the quality.