My husband was doubtful about a Rainbow vaccum helping with his allergies.  He is now a believer.  It is pricey, but well worth the investment.  It's amazing how much dirt it picks up.  Usually when I vacuum you can see the dust particles in the air (especially by the windows), but NOT with the Rainbow.  It's amazing not to see the particicles floating in the air!  The machine is a must for anyone with pets!