Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dissapointing burr grinder

I bought this grinder after reading about the superior performance of burr grinders, compared to the usual whirly blade style. The design looked promising, and the price was right so I bought it. Unfortuately, with burr grinders, as with almost everything, you get what you pay for. This grinder is of very poor quality. In the few months that I have owned it (and it's successive replacement after the first one broke), the plastic upper hopper has broken twice, during normal use. The grinding mechanism jams all the time, and produces an inconsistant grind, varying from big chunks to dust. Additionally, it is impossible to get this machine to grind fine enough for use with an expresso machine. Save your money for a better grinder, this one is a paperweight.