* OVERALL: This makes the room smell reminiscent of a health facility because it makes the air so clean and has noticeably improved the number of sinus infections I get.* Noise: it can get loud on level 4+ but that is because it's taking in and pressing out a lot of air. At 2 or below, it's quiet enough to watch tv alongside and still be able to hear. At level 3, you could get by with turning the tv up slightly. For conversation in the room, fan speed 3+ is a no go.* The Ionizer: The ionizer can be turned off by holding down the bottom blue button with the star on it, which I always keep turned off. Since the mere presence of an ionizer and plasma tech can release ozone even when not in use, I wish I could remove it. Ozone means particles are larger, heavier, and stick to the insides of your lungs more easily. This causes lung irritation and keeps irritants within the lungs more securely and for longer periods of times. You generally don't want to breathe ozone in you have no respiratory issues, and if you have lung sensitivity, allergies, asthma, COPD, etc., you're really going to want to avoid it entirely.* Size: The unit is big, about 2.5' tall, and the air intake is on the sides.* LIGHT ISSUE: I wish the lights that illuminated the buttons could be turned off at night, as the light keeps me awake (blue light). I've resorted to covering it with some fabric, which covers the import and export vent slightly. AERAMAX, PLEASE provide an option to turn off all the lights. The light shines from the buttons, and also shines out the sides of the device through the intake vents in a darkened room. Any light disrupts melatonin production, and blue light is the worst suspect. After over a year of 24/7 use, I'm buying another brand of air purifier just to alleviate this issue of fighting with the light emanating from the machine.* Weight: Heavy. This is not something you're going to want to move from room to room. It has a handle for carrying it if needed, but you're going to want to leave it where you left it. Since it's wide and narrow and tall, and thus tippy, you're not going to want to attach wheels or place it on a wheeling base to combat the weight of moving it.* Filters: The carbon filters appear to need replacing twice as often as the HEPA filters.* Aesthetics: I would have appreciated the black areas of the unit being white, to lend a more sleek and modern vibe, as it looks more like a 1990's space capsule with it's shape and contrasting black and white. Something about Nintendo comes to mind, and ET.* Structural Design: I love that the vent that blows the clean air is at the top, and can be tilted and directed where you want it. You can aim it to blow right at your face if you have a sinus headache and/or breath clean air while you work on the computer or watch TV.* Longevity/Quality: 100%. I have used this device 24/7 at fan speed 3 for over a year and it's still going strong. It's gone through 3 HEPA filter changes, and 4 carbon filter changes, not always replaced on time ;)UPDATE:After 4 years and 4 months of 24/7 use on fan speed 3, this air purifier LIVES. It has no issues whatsoever and works perfectly. A+ for quality! I resorted to covering the lights with black electrical tape. This means that every time I move it to another room and turn it on again, I have to lift the tape at the bottom and press the ionizing light to turn off the ionizer, then press the tape back down while trying not to trigger the other buttons. The light from the other lit buttons is slightly visible from the sides where the intake vents are located. I have no complaints about this item except for the lights. It could be quieter as well, if I'm being particular, but the required CFM for an air purifier to do well really requires that it moves a lot of air, which makes noise.