I've been using the Shark NeverChange Air Purifier MAX for nearly a year now, and one of the biggest selling points has already proved itself: I still haven't had to replace the main filter. If you've owned air purifiers before, you'll know that replacement filters can become an expensive ongoing cost, so the promise of long-lasting filtration is a real attraction. One of the things that has impressed me most is just how sensitive the air quality sensor is. We have about 1700 Sq Ft of open plan living downstairs and it's all within the the Air Purifier coverage. Within minutes of cooking, the display detects a change in air quality and the purifier automatically ramps up to a higher setting to clean the air. It's genuinely impressive to watch it respond so quickly, and it gives you confidence that it's actively reacting to what's happening around you rather than simply running at a fixed speed all day. I've also noticed a significant reduction in cooking smells, which is a big plus. Rather than having lingering food odors hanging around the house for ages, the purifier seems to help clear the air much more quickly. The odor-neutralizing cartridge is an additional feature, although the main benefit for me is how quickly the unit responds to changes in air quality. The Debris Defense system is another feature I appreciate. It catches larger particles such as hair, dust and pet dander before they build up on the main filter. Cleaning these screens is straightforward, and being able to vacuum, wipe or rinse them makes routine maintenance easy. I suspect this is an important part of keeping the purifier working effectively over time, and it's certainly preferable to having to replace expensive filters frequently. The air quality display is useful, too. Being able to see the readings change in real time makes it easy to tell when the purifier is working harder and when the air quality has improved. Just bear in mind that a 100% clean-air reading means the sensor's measured particle concentration is at or below its detection limit, rather than indicating that absolutely every pollutant has been removed. There is one downside worth mentioning: it can get a little noisy when running at full speed. You definitely know it's working when it ramps up, particularly if you're nearby. Personally, I consider that a relatively small price to pay as you need increased airflow during this time for cleaner air, especially when cooking has caused the air quality to deteriorate. At lower speeds, it's almost silent, even at medium speeds much less intrusive, and the automatic adjustment means it doesn't need to run flat out all the time. Overall, I'm very happy with the Shark NeverChange MAX. Nearly a year without needing to replace the main filter is encouraging, the automatic air quality monitoring is impressively responsive, cooking odors are reduced noticeably faster, and the maintenance is simple thanks to the removable Debris Defense screens. If you're looking for an air purifier for a larger living space and want to avoid the expense and hassle of frequent filter replacements, this is well worth considering. It isn't completely silent when working hard, but for me, the performance, convenience and potential long-term savings make that a worthwhile trade-off.

It lasted less than 5 months! Very disappointing for the price we paid.

All in all this little buddy has worked well at freshening the air. I really appreciate the outside screens that I can clean that extends the life of the filter inside. It operates pretty silent when running in auto mode. It is a bit bulky but worth it.

Great purifier for the money! I bought it because I have a small apartment and cooking leaves behind some smells. It took care of that no problem as well as leaves the place smelling very fresh. Thank you Shark!

Folks with Allergies you need this air filteratiom in your life which is easy tk move around as its light in weight and have tones of features for your needs . It's beautifully designed and the never change filter saves you so much on filter refill bills so go get it

El clean es un aoarato muy confiable y loa cambio del aire se refleja

Ive had my air purifier for about a month now and I love that you can bearly hear it running.

I am grateful for my Shark, Never Change, Air Purifier. I was suffering from sinus for almost a year, and now, after 2 months, I can breathe and smell again! One feature I like, is that the fan speed may increase, if it detects a pollutant, to clean the air quickly. It decreases back down, once clear, to save on electricity. I mainly keep it on my nightstand, but have used it in my office and basement too. We left on vacation, and mived it in the basement with our two cats and 5 litterboxes. The air wasn't bad, considering the time & use of the litter. The filter screen was easy to clean and the Hepa filter looks good, also.

SUPERB product, silent and effective. It is also quite attractive and almost invisible in the home. Outstanding customer service which will keep me a loyal Shark customer.

Cons: 1. The air filter lasted 9 months. I'd usually have it on when I get home from work, almost always on auto. I didn't expect 5 years, but 1/5 of the advertised lifetime is disappointing. 2. The bottom rotating lid/door for filter access does not click or snap shut or anything. It is very, very prone to opening whenever you move the purifier. Other reviewers mention this. It's more annoying than it sounds. 3. Figuring out the replacement filter situation should be easier. Here's my free advice to Shark: the ease of figuring out replacement filters should be a selling point. Pros: 1. Seems to do its job, especially with smells. It does have a scent packet thing, but it runs out quickly and in my opinion isn't needed. If I were willing to spend the money, I'd get the scent refills. I hate strong scents to the point that I think kitchens should be separate buildings, but this scent is well made. 2. Very simple, straightforward interface and controls. No ridiculous app to download or a maze of menus to scroll through. No complicated set up. Just plug and go. I'm giving it 2 stars because they should be more realistic about the 5 year claim, and the bottom filter lid needs to be fixed. Other than that, I'm happy with it and don't regret purchasing it at all. I personally, would rather have a rectangle shaped purifier and I wouldn't put the output vents directly on top. If something falls into the top vents, it's pretty much stuck in there even if you turn the purifier upside down and try to shake it out. You will hear the tiny crunching rattling sound when the fan spins.