Product review (4 stars): Great Machine, High Priced Filters
I've owned my machine a little over a year.  It works great at keeping the air moist.  I live in Arizona and the air is so dry.  The filter, on the other hand, don't last long enough, but if I want to use the machine, I have to buy them.  I agree with the other reviews, the filters did seem to dry out pretty fast, but they seem to last longer if you keep the machine running continuously (24/7).  Now I only use one filter, instead of two.  It's been working just fine and my filters last a lot longer.