I love my new Navigator Vacuum.  this is the second Shark vacuum cleaner I have owned and am really enjoying this "Cadillac" of a vacuum cleaner.  I was looking for a convenient  machine with self cleaning parts and one which provided a quality cleaning experience.  not only is it a 5 star machine from a 5 star company but it has so many fantastic features.  not least of which being the self cleaning Brushroll.  its also Hepa certified with something called 'Anti Allergen complete Seal technology".  if you have allergies like me, then this is your machine.  other fine features include the Upholstery tool extension and the swivel steering.  though new, I can tell the machine is well built and will last me for years.  for these reasons, I highly recommend it.