It came right out of the box and was ready to go except for a missing pre-filter. I called the number on the literature in the box and I had a replacement pre-filter within a week. Supposedly the pre-filter is in the original box - but that wasn't so in my case. But the problem was solved with a minimum of fuss. I think the air purifier works. It's hard to know since we've had rain lately and the air was cleaned by mother nature. I like that this air purifier is floor based. I already have too much stuff on my countertops. It does has a blue light that indicates the unit is on - in a dark bedroom the light is rather bright. I have just laid a washcloth over the light and now the unit is dark even when in operation. I don't think it is especially noisy - it's kind of a white noise. I think this was a good purchase.
My son gave this to me and I have been using it for over ten years and it is still working fantastically. The filters are easy to get to and change. They are quiet as well and i keep them in all rooms. My only problem is remembering to look for the light indicating I need to change the filters.
Added the purifier to our bedroom and cut down the hair dander from our pets in half. Ordered the larger unit for our family room. Easy clean filters. Great size. You can use as an extra fan and quite enough to sleep at night. The clean filter indicator is a bonus! Excellent value for size and options. Hopefully it can last as I run it 24/7
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