My son and I suffer from seasonal and environmental allergies and air purifier like this one are a life saver.
We have air purifier in each bedroom as well as our family room and it greatly improves our overall air quality.
I use the Shark Air Purifier in my master bedroom and I wake up less congested ever since I started using it.
It was very easy to set up, is easy to operate and fairly quiet. I like the 3 in 1 options of just running it as a air purifier, with an added fan as well as with heat.