I've had other air purifiers in the past, but this is, by far, the best of the bunch! It has all the features I've ever wanted in an air purifier for a more reasonable price than other brands with similar features. There is a noticeable difference in the air quality in my home and this has definitely improved my allergies. I am now sleeping better, not only because of my allergy relief, but because my dog is no longer snoring since it has helped her allergies as well! Thank you Alen, for a great product!