Instruct: Classify a review into positive or negative sentiment.
Query: be careful before replacing this

Mine stopped working after a year or so, though the motor was ok. I had heard that grinding white, uncooked rice would clean one and mine ground the rice fine but beans would not go through. Unscrewed the hopper and found pasty residue around the feed tube keeping beans from going through but smaller rice was no problem. Cleaned the hopper tube with wet paper towel and back in business. Only objection now is high noise level.