Product review (3 stars): Sinus problems?  Vornado Evap 3 owner?  Read here.
Don't get me wrong... I love the product and how it helps me with my sinuses. However, it is quite costly for a few wick filters.

Using the oils below and ROTATING the wicks every fill up will double the life of this product.  By double, I mean it makes it last two months without looking horrible and filled with mold and bacteria.  You will know when it is time because when you start to flip them the material will pretty much rip off of the filter itself.  If you have sinus problems, I recommend the recipe below that works WONDERFUL for me.  I have had sinus surgery in the past because of having a battle with chronic sinusititis.  No more infection, rarely get sick, happy life!

My recipe for sinuses:
1.  Grapeseed Oil Extract
2.  Peppermint Oil Extract
3.  Tea Tree Oil Extract
4.  Lavender Oil Extract
5.  Euclyptus Oil Extract
(All from Now Foods, no I don't work or get paid by them)

All and all, I think this is a decent product, wish it was a little bit cheaper, but I will buy them until another humidifer comes out!