I bought 3 of them recently. 1 was free for buying 2 and my friend wanted one.

The one I bought is probably close to the smallest and is adjustable so that it will go from something like .5 to 10 whatever that means.

I was planning on putting it in a 3x6' room and having it help out with the smells.

The $120 price tag is going to keep most people away I think. When I have tried these things out I will provide feedback.