I have owned this vacuum for approx 4 months now.  I originally had the  SHARK ROCKET which still does a great job in the game room down stairs.  I purchased the DUO CLEAN with ZERO-M because the advertisements were compelling.  They were right !  Love the DUO CLEAN roller.  My hardwood floors are so much easier to maintain now.  The ZERO-M really works !   No more hair wrapped around the roller.  By far the best vacuum I have ever owned !  BRAVO for making a product that actually performs as advertised !