Wal-Mart and Amazon.com have online reviews of the Shark Sonic Duo Carpet and Hard Floor Cleaner. Reviews also include user ratings based on five-star scales.
Five-star reviews at Wal-Mart's website mention the effective pre-treatment product, the light weight of the cleaner and the ease of moving between carpet and hard floor. Negative comments state that the cleaner is ineffective on carpet stains and leaves streak marks on floors. Positive reviews at Amazon.com discuss how well the appliance picks up dog hair from carpets, how quickly carpets dry after treatment and how little noise the machine makes. Some critiques say that it does not clean adequately and does not extract liquid well.