alot of us have probably seen the bissell healthy home commercials, and how they claim that it has non stop suction power. well, on bissell's web site, i did some reading in the healthy home's users manual (in pdf form), and it says that the filter should be replaced every six months, or if suction power is decreasing. so, bissell's tv ad states that this model has constant suction, and the user guide to this model says it's suction power decreases. the replacement hepa filters cost $24.99 each on bissell's web site to replace. so in my opinion, if you want a vacuum that truly never loses suction, buy a dyson. i have one, and love it, and you will too.