do you think that air purifiers work, or help your health.?

Like the ionic breeze, or the oreck xl.
I know they filter the air, I can tell by what I wash off of the electrodes, but do they help the health by reducing bad particles, etc.?

Or can they be harnful? Do you like yours?

I got both of these at a thrift store for like, 10 bucks each, so I didnt pay the outrageous original prices for either of them.
They really take a lot of crap out of the air. Those electrodes are just coated with it.