If you're anything like me, you value the cleanliness of the air that you breathe.  I've been quite pleased with the performance of this particular air purifier for that very reason alone.  Setup and operation is very straight-forward and simple and I love having the reassurance that the air that I'm breathing in (and the air that my children and guests are breathing in) is clean.  I honestly can't backup any claims with scientific proof, but I have faith in this product and the HEPA filter to provide cleaner air coming out than what is going in.  The purifier itself is quiet and unobtrusive.  I would recommend this to anyone looking for a product that will help purify their surroundings and the air that they breathe.  I'll be using it consistently well into the future with what I expect to be continually satisfied results.