Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Inconsistent results: unsuitable for French press coffee

I purchased this for use with a French press coffeemaker, which requires coarsely-ground beans. Despite using the "coarse" setting on the Mr. Coffee grinder, it produced very inconsistent results. By the time most of the beans are at least coarsely-ground, half of them have already been pulverized to dust, which tends to clog the wire mesh in the French press. I returned the Mr. Coffee to Amazon for a refund.