I owned a Shark vacuum before buying the Navigator Upright.  It was a professional model, so rather heavy.  Still, it performed for much longer than I expected, until the hose finally broke at two stress points.  The product quality encouraged me to buy another Shark product.  I am not disappointed.  Well designed and more powerful than its predecessor, it is a breeze to use.  Want suction power at a reasonable cost and lightweight too?  Go Shark.