NEWTON, Mass.--(BUSINESS WIRE)--For the second year in a row, Shark® has been ranked the “Highest in Customer Satisfaction with Upright Vacuums,” according to the J.D. Power 2015 Vacuum Satisfaction StudySM. Now in its fourth year, the vacuum study measures satisfaction with upright vacuums by evaluating six key factors: ease of use, features, performance, price, styling/appearance and warranty. Shark has once again bested Dyson® in the upright category, and took top honors in more study catego
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