I was one of those that researched the purifiers in the marketplace extensively.  I decided upon the Purezone Halo for a variety of reasons.  High customer reviews, ease of use and most especially functionality for such a small unit.  I needed purifiers that worked but didn't take up a lot of space.  This unit fits the bill completely.  I've since purchased several more for my home, and one for my daughter's college dorm.  I did have a minor issue with one after one year of use.  HOWEVER, customer service was a breeze.  My representative April, was efficient, expedient and extremely friendly.  

If you're looking for a good quality and solid air purifier for smaller spaces, this one is for you.  You won't be disappointed.