I live in Northern CA so I sadly now know more about air purifiers than I ever wanted to. The past few years have been very difficult on air quality due to all of the fires. I have three little air purifiers in my house, plus two space heaters, plus two fans. NO MORE! This combo situation is amazing! I've had this for a couple of weeks and (thank goodness) we have had no fires so I haven't tested this unit under great strain, but I love it already and I'm sure it will be great if needed during very poor air quality times.
And, unrelated, but I'm consistently surprised by how pleased I am with Shark products. Love my vacuums!