Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Highly prone to failure

We purchased one of these units a couple years ago now. We used it all of 5 times over the last 2 years and it broke down 3 of those 5 times. Two of those breakdowns required us to go out and rent a unit to finish the job.The main problem with them is the cheap plastic parts used for the beater bar mechanism. This is the major mechanical work area and is subject to stress, heat and friction that is simply incompatible with plastic parts.The very first time we used it, the plastic gear that meshes with the belt stripped and it had to be replaced (under the warranty fortunately). The 3rd time we used it, the belt broke and we replaced it ourselves with the included spare. The 5th and last time we used it, the swing arm that holds the beater bar melted and welded itself to the beater bar. Both had to be replaced. This is a 60% failure rate! So I highly advise you look elsewhere for a carpet cleaner. I wouldn't recommend this thing to anyone.