I have this in my upstairs master bedroom and it senses when someone is cooking something downstairs in the kitchen, changes color and adjusts the fan speed accordingly - amazing! Sometimes even catches it before the i75 we have downstairs! It’s still new for us so I’m not sure yet if the upgraded filter is worth it but I love the nightlight feature and ability to turn it completely off at night since it’s in the bedroom (currently not a feature on the i75). I have allergic asthma and am hoping this helps some. Quietest air purifier I’ve ever owned, you wont be disappointed with this purchase!!