Hi Guys.. ok i did my own lil comparison with two vacs... my trusty ol hoover convertible u4411 and i had the privledge to try out a simplicity symmetry for a day.. well.. i was suprised! I put a clean bag in my hoover and vacuumed the whole house with the Simplicity ..took off the Simplicity bag and found it did quite well and picking up dirt that i THOUGHT my hoover left behind. WELL i go back over the same areas and vacuum again with my Convertible and was very suprised to find dust in the new bag i had just put on the convertible.. SO with that being said..Is the Simplicity not as great as said to be or could my Hoover just have been picking up loose fibers the Simplicity left behind? Becuase it was gray in color like dust...it wasnt tons.. but still the bag was dirty... is the Simplicity lacking anything because the guy at the vacuum shop swore by it.. that this would out clean ANY vacuum cleaner and just went on and on.. so that why i brought it home to try out. For such an expensive vacuum you woulda thought it woulda cleaned better? Could it be the design? the simplicity is a clean air bypass motor design, and my convertible a direct air design... any feed back? Hands down im just gonna save my $600 and stick with my trusty old convertible..