I purchased 2 of these to replace older Bissell air cleaners. Unfortunately I returned both. The reason I returned both was because of the automatic "Eco" setting. I am a firm believer that when an air purifier is constantly filtering air, even at a very low setting, that it will read the air pollution more accurately. These air purifiers have an automatic "Eco" setting that turns the fan off. You cannot set it to filter at the lowest setting without it turning off after 5 minutes or so. Definitely felt like our Bissell air purifiers cleaned the air more often then these brand new ones. So I returned them. Also, the design of the filter housing at the bottom of the unit is nice but not practical. You have to be VERY careful when repositioning or moving the unit because the filter housing at the bottom will unlock easily and when you lift the unit the filter comes out. Not every time but often enough to where it becomes annoying. One last thing. The overall design is beautiful but since it is a cylindrical shape it's not very practical if you are positioning it against a wall. It sticks out like a sore thumb.

When we first plugged it in it stayed on 100 % air quality without fluctuating, so we thought there was something wrong with it. But then, we cooked a meal in the kitchen,(the unit is in the next room) And the air quality went down, the unit came in and stayed on until it was 100 % again. Highly recommend

Worst machine I ever purchased! I bought it from an online retailer and it lasted 3 days! On the third day the LCD screen started to flicker and no longer showed the percentage of air that was clean. I also found (in the beginning) once it got to 100% it stoped filtering the air. I returned it. A machine should not start breaking down after 3 days (check other sites for the negative reviews). There are much better air filters out there that will last more than 3 days.

[This review was collected as part of a promotion.] The Shark Never Change Air Purifier Max is a great addition to my bedroom. The air circulation in my room is great, and it smells really good with the odor neutralizer cartridge. You can purchase replacements. I LOVE that the motor is whisper silent. It won't affect my sleep. It reads the air quality levels in your room. I am so happy to have this. I am going to recommend it to a family member who has allergies. I have used it for a while before I did this review to give an accurate assessment of this system.

[This review was collected as part of a promotion.] Most of the time people don't think about the air around us, if it is good or bad air. I didn't think about it and you wouldn't believe the bad air that is around all of us, in our homes, outside, everywhere. I couldn't believe how much bad air that was around me and my family until I received the Shark NeverChange Air Purifier Max from influenster for free to review. I thought that there might be 5% to 10% of bad air but after it read the air and showed me that there was 36% bad air in my house I couldn't believe it. Every since I seen that there was 36% bad air around me and my family that day, I haven't quit using the air purifier to clean the air out in my house. It has made my house smell better. There is a big difference in the smell of good air compared to bad air. It even helps you breathe better. You wouldn't think that air could have so much to do with the way that you breathe but it really does. I am planning to buy a couple more of the Shark NeverChange Air Purifier Max so that I can put them in some of the other rooms in my house. It is quit and you don't hear it at all unless it detects any bad air and then you can hear it while it cleans the air but it isn't even loud then.

This purifier has exceeded my exceptions! I have it in the kitchen for maximum purification. It is powerful enough to draw in hairspray odors from upstairs bathŕoom. It effectively traps cat hair and absorbs kitty litter odors. The fact that is is easy to clean the removable side filters and the large hepa filter that lasts for 5 years is a plus! Great product!

Gave this Shark Never Change Max air purifier model HP302 a true 30 day test and I can say highly recommend it. The dust shows after 4 weeks running on auto. Then we set up the humidifier. Because we have a water softener that uses salt and peroxide it only took 15 minutes till our air quality dropped to red the unhealthy level. Turned it off and it took 1 hour back to get it back to blue 96 % and it holds their until we put wood in the basement stove and it drop to the low 80's for about 30 minutes before going back up to 96 to 98 percent good air quality. And we haven't had any sinus issues after we bought a counter top water distiller From home improvement store using with the air purifier combination. No while dust going into our lungs. And we only use distilled water we made from the distiller in the cool mist humidifier we use.

Shark is a fantastic company and have always made things right, now I had a six fan air purifier and the clean air sensor went bad so they sent me the never change max and I've had for few weeks and now the clean air sensor is not reflecting clean air like my other air purifier's. So I'm going to contact them tomorrow to see what they will do about this one.

[This review was collected as part of a promotion.] I just received it but what I can say so far is that it is quiet. I have a baby so that is important. Also the odor neutralizer smells good, I will not be using it until my baby is older however. I am looking forward to seeing how it does compared to other purifiers I've used.

[This review was collected as part of a promotion.] Shark NeverChange™ Air Purifier MAX works really well. It really cleans the air in a large area-1400 feet. Ithas cut down on the dust and makes the air better to breath in summer. We were coughing even with the air conditioner going but when we used the air purifier the coughing disappeared. I know that it is going to work great in the fall and winter months.