Bests & Worsts Reviews from Amazon

This needs to be prefaced by a huge warning: you can no longer buy full size HEPA filters from the company, you can only find full size after market filters which are very shady (I purchased one and within a month the unit was telling me it needed to be replaced). The companies solution to replace the HEPA filter is to stack two "half" size HEPA filters which do not filter as effectively and can make a whistling sound. If you buy this unit understand that you are doing two things: first you are buying a legacy HEPA filter (these went on market around 2000 - there have been dramatic improvements in terms of balancing the sound of units with the effiency of the unit). Second, and more importantly, you are buying a unit that will basically have to be fully replaced at the end of one year because you can no longer obtain brand or full filters to ensure its working properly. I cannot recommend this unit as you will have to spend another $119 in a year to replace if you want to ensure it is still working at the level you expect. You will end up spending $238 dollars within 12-18 months if you are aggressive with your filter changing. Despite what the manual may say the life expectancy of these HEPA filters in the real world is much shorter then in the laboratory testing. My advice for you is that if you are considering buying a HEPA filter, move on from this unit. It's ancient technology (2000 or so), loud, and you cannot get full size HEPA filters (only two half size HEPA filters which you are supposed to stack) from the company so you have to rely on questionable aftermarket vendors for the filters. Please do yourself a favor and as someone who has breathing problems, here is my advice: it may be sticker shock but you will definitely get what you pay for with these units. If you are willing to spend $119 or this unit, I would recommend saving up a little longer so you can look at units around the $202 price point. The technology and quality is night and day, plus you can get filters for their units. This unit is just wasting your money.