Purifies and humidifies at the same time. No expensive filters necessary.

Author's Rating:

Pros: Low maintenance costs. Easy to clean and maintain. Low power consumption. Quiet. Ten year warranty.

Cons: Initially more of an investment.

Author's Review
It doubles as a air humidifier and cleanser at the same time which is great for the winter months. The unit is sturdy, runs relatively quiet and does a great job of filtering and humidifying air. The initial cost might seem a little higher than other products in the same category but since it doesn't require any expensive filters, no significant costs occur in the maintenance it turns out to be cheaper than most of the other products in the long run. You will need to purchase a treatment additive with runs $16.99 normal, $19.99 with fragrances and covers 5 months of use.
I must say that my allergies have all but subsided after purchasing this unit. I wake up in the mornings a lot fresher and feel much more comfortable/healthier in my home. It also doesn't use more electricity than a 30 watt light-bulb (for the 250 square feet unit.)