Holmes HAP412BN-U HEPA-Type Mini Tower Air Purifier

This unit cleans a surprising amount of filth from the air and is suitable for a small room.
I wish the unit accepted washable filters.

UPDATE Aug. 2010: I have knocked the unit off the shelf onto the carpet several times and it still functions. Still amazed at the amount of particulates it traps.

I've used this for about 6 months now and it does a decent job, with a noticeable change in the smell of the room (this is due to the ionizer i think). Hasn't eliminated dust buildup on surfaces but dust buildup has reduced as far as I can tell.

However, now it is time to change the filter and I'm considering just getting a different purifier. Right now, a 2 pack of filters for the HAP412 are going for about $31. Considering that's almost the cost of the purifier (with 1 filter included), I'd suggest trying a purifier with a reusable/washable filter.

It's quiet enough on the lowest setting and seems to do an OK job purifying but ultimately the filters are way too expensive.

Small unit but powerful! We first tried it out as a loan from a neighbor and noticed an IMMEDIATE change in our baby's room air quality. After doing research to purchase our own we went with the same one for various reasons: Very affordable, small unit, powerful, quiet with adjustable settings(just like a pedestal fan), and finally and most importantly, does it's job (evident in our baby's cleared sinuses)! We are extremely happy with it.