Great for controlling odors
I purchased the Germ Guardian GG-1000 Air Sanitizer because of a newspaper article and user reviews recommending it for odor control.  My initial skepticism quickly disappeared as it has effectively controlled persistent odors in both a small bathroom and the adjoining bedroom, which is larger than the product's stated capacity.  The only downside is the noise, but closing the bathroom door at night eliminates that problem.
Rating: 4 stars