Bests & Worsts Reviews from Amazon

I bought this model specifically because it claimed to reduce radon gas. After several months of use and daily testing of radon gas levels -- this air cleaner has had zero impact on radon levels. I have a border-line radon issue in one small room of a basement. I'm not asking to have the machine eliminate all of the radon. But to have daily radon readings of 4.0 ppm not drop to at least 3.9 ppm? I wouldn't think that is asking for too much. A response from the Manufacturer said that a radon mitigation system may be required. True, but then why does IQAir advertise that this model can............ ?? (SMH) Beyond that, however, this machine is otherwise just an overpriced fan, not a good air cleaner. Yes, it blows air. But does it clean the air? Think about this logically: if the filters only need to be replaced every 18-48 months, how much dust and debris can they possibly be collecting? The better an air cleaner is, the more debris it should be collecting in its filters. So, after having no affect on radon gas, I moved this machine to a larger living area of my house. Now, I routinely change my furnace/air conditioning filters every three months; and when I do, those filters are full of dust. And my furnace (/Air Conditioner) only runs a few hours a day. Now I have been running this IQAir cleaner for 24 hours a day for over three months and the filters (I removed and checked) look as clean as the day I bought them. If they were in fact collecting dust, pet dander, pollen, etc., they should look as bad as (if not worse than) my furnace filters. I should be able to see it. In fact, they should be fully clogged up in just a few months. Buyer beware. If the seller says that you can go for 18 months before changing filter #1, 24 months before changing filter #2, and 48 months before changing filter #3, then these filters are probably not collecting a lot of debris (aka: not doing a great job). -- But I will admit, this machine does blow a lot of air - at 6 different speeds. I just spent a fortune for this six-speed fan. Update: I'm sorry but I have to adjust my rating of this machine all the way down to just one star. After several months of use, it is now my opinion that this machine does nothing more than circulate air, and is actually making the dust problem worse. At least prior to having this machine, my furnace filters were collecting most of the dust and pollen, and the remaining dust just settled on the floor and got vacuumed. This machine, on the other hand, just circulates the air without collecting any dust in its filter, and the dust now get kicked up and thrown everywhere. The faster the fan runs, the more dust is thrown and settles to higher objects in the rooms. I'm noticing more dust on top of furniture and curtains and walls and pictures than ever before. I've stopped using this machine and I am going to get one that actually has filters that collects dust, with filters that can be washed or replaced frequently and inexpensively.