While Dyson IS expensive, I have enjoyed every Dyson product I have ever tried. This air purifier is no exception. It IS expensive, but it's worth it!! We can cook a meal in the kitchen (our air purifier is in between the kitchen and living room. We have an open plan for the two rooms) and within seconds, on auto, the fan will increase to whatever level is necessary to clean and filter the air. It comes with a nice little remote control that sits on top of the unit and is held in place by a magnet. It also has an app you can download to control the unit. Putting it together is super simple. Just snap the top part, to the bottom and plug in! Easy!! Filters are a bit expense, but they only have to be replaced once a year. The fan is super quiet, even on 10 its pretty quiet. Anything 7 and under, you won't even hear. So far, we have loved this unit. It says it has odor control, but, we have 4 cats and a dog and our house still has some odor from pet accidents. However, the overall smell is not as bad as it used to be. I haven't noticed us needing to dust as much as we used to either!! So, that is a definite plus. I haven't checked the HEPA filter since we bought it, but I guess I really should. Just to see how much it has captured.
Overall, I would recommend this unit. As stated prior, it IS expensive. But, it is super quite and does a very good job.