Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Beater Brush/ Rotator Cracked On Mine in Less Than 5 Minutes. TWICE!!!

Read a lot of reviews and decided to take the plunge and spend the money on a DC 14. Went into Best Buy, and bought a "demo/open box" for $309. Returned home happy with my purchase and immediately started vacuuming. No Problems on the hard wood floors, I transitioned to the carpet and almost immediately heard a loud crackling sound from the brush housing. Looked and noticed it had cracked and warped at one side. Figuring this was the bad luck of a "demo", I returned to Best Buy, returned the "demo" and paid $399 for a new one. Returned home and returned to vacuuming. This one lasted all of 5 minutes before I heard the same dreadful crackling sound. Low and behold to my utter horror and dismay, the same piece had cracked once again! It is absolutely ridiculous that a vacuum at this price has such a pi## poor design.I would avoid this model like the plague.