By now, modern vacuums have progressed way, way beyond the visions of those who invented and designed cleaning appliances in earlier times.  We've traded our brooms for robots, for vacuums with power drive, bagged and bagless models and some with hoses that will get you from here to Tennessee without picking up the machine once.  Some now give you the nod for no more than a quick pass over certain areas of less traveled floor in your household or alert you to haul out the big guns because the war on dirt definitely has begun on the path from your front door to the kitchen.
 
However, despite all the technology and all the features there are for us to avail ourselves of, one rule still applies -- use your vacuum regularly.  No matter how powerful, well-designed or well-accoutred a vacuum is you cannot make magic with it.  Neglected carpeting and flooring will not become clean or renewed instantly no matter whether you spend ten bucks or ten thousand on a cleaning appliance.  
 
What count's is reasonably frequent use  -- at least a couple of times a week.  It will keep carpeting and flooring fresh from the store looking good for a long long time.  Though it will not remove stains or reverse the results of wear, it will over time bring about marked improvement in the look of carpeting that's been neglected.  
 
No matter the price, the style or brand, the best vacuum still remains the one you're willing to use.
 
Happy New Year,
 
Venson

"A Clean Home is a Healthy Home"
 
Carmine D.

J-P-T:
 
I think I read and/or heard something very much the same.  Apparently, if I recall the facts correctly, the existence of a low level of dust/dirt in the home helps the human body build up tolerance (immunity) that otherwise it can't if the environment is pristine.
 
Carmine D.
 

reminds of  what my mother always said
"a vacuum is only as good as the person  pushing it"
mom always  did  vac slowly with over lapping strokes, she said " if you dont have time to do it right the first time, when are you going to have time to do it again"