Air Purifiers

Just bought one for about 80 bucks. Has anybody with asthma used it and has it helped?

I’ve seen many negative reviews and some positive. Don’t know whether to take advantage of the money back guarantee…

What do you think of it? I just got one for Xmas and I think it’s a little weird how it doesn’t blow air out evry well…as if it’s not circulating but I read that that’s just how it is. Also, I cleaned it twice already in 2 weeks and there was a film of white stuff on the blades. How "thick" does the dust get on it? Will it still keep picking up allergens and dust even if there’s already some on the blades?

http://www.sharperimage.com/us/en/catalog/product/product__SI995YYY/sku__SI995YYY

that is what I’m about to purchase - any recommendations?
I have severe dust allergies (sorry that got cut off). I have SEVERE dust and asthma - I need clean air. I clean like a nut but nothing really helps.

and is it dangerous to breath it?

My mother had an ionic breeze running in the basement all night long on the highest setting. Though the basement is somewhat large, there is no air circulation down there to disperse or diffuse the ozone produced by the "air purifier" as the air conditioning is currently malfunctioning.

I was down there for approximately a half hour when my nose began to burn, and it was at this point that I immediately thought to ascertain whether or not the ionic breeze was on. Seeing that it was, I promptly returned upstairs and the pain in my nose subsided and eventually abated.

I’m asking this because I’m curious if I could, feasibly, have been inhaling unhealthy amounts of ozone - and if so, could my lungs, olfactory lobe in my brain, or any other internal organ have sustained cell damage?