When I bought them 2 years ago, I had allergies to dust and mold and my oldest son (1 1/2 at the time) had allergies to dust and other things. When I did the research, this model was the cheapest, but still looked as though it did what the others do (in particular the Sharper Image Ionic Breeze). So, I bought a couple and liked them so much I bought more.
Yes, I believe these did help to alleviate my allergies and I like the "fresh" smell that they give to the air. Due to the mold allergy, I would wake up most mornings prior to installing the air purifier with a headache. Once I had the unit in place, the headaches rarely ever returned. I have since gotten rid of my allergies all together by doing liver flushes, but I still continue to use the air purifiers in my family's bedrooms.
I did send the company a few emails with questions prior to ordering, and they were always quick to reply.