Product review (5 stars): Great investment-especially for people with allergies/asthma
I purchased this unit over a month ago, because I live in the valley (PHX AZ) and there is a problem with air polution during the fall to spring each year.  I also quit smoking a couple of years ago and go figure I now have a bit of asthma.  I've tried a few cheaper air cleaners that just did not seem to do anything for me.

  Like the enclosed brochures say, you must use the water treatment and it can go through a gallon in a day.  Mine does exactly that, and I do notice a difference each morning when I wake up that it helps make my breathing a bit easier.

  As far an annoying clicking, there is a very light clicking when it runs, but come on, if you need absolute complete silence to sleep try a library.  I appreciate just a light bit of background noise when I sleep anyway.

  When I clean it every 2 weeks as suggested, I do also notice some dirt/dust residue in the reservoir.

  As far as the price not being so nice, I purchased mine at Bed Bath and Beyond and used one of the 20% coupons which knocks it down a bit ($40).  It's like anything else in life-- you get what you pay for.  I'm glad I made this great investment.