The Classic 605 is okay. I like the fact of what it can do. However, I have to turn it up myself if I feel the need to breathe better. It's too bad that it doesn't have an auto function. I also feel that the fan is too loud on the third setting. The second setting is almost similar to the first setting so I'm not sure why they make both settings.

We received and set up our unit 3 weeks ago in our master bedroom to help control the dust/dander accumulation. We noticed the air was fresher within a few hours. We dusted the room first and so far there is little or no dust settling in usual places. So far so good.

This thing is soooo quiet on low and medium and it works!!! A little noisy on high but I use high only for "emergencies". Four stars because it has one very annoying fault--no handle to pick it up!! I move it from room to room and I have to lift it up from the bottom (! -I'm over 70 and bending down that far is getting harder and harder) to go over thresholds and rugs!!! Even just a small finger indentation would work!! but nothing.

I purchased the BlueAir classic a little over a month ago - and the sole reason I bought this system was to remove the terrible VOC's off-gassing from my newly purchased desk. The VOC's were so strong in my office my eyes would get watery, and irritate my throat. I purposely purchased the 605 as it is oversized for my office/ living room (approx 350-400 sq ft) in hopes it would do a better job of cleaning the VOC's in here. A month or so later, I still can smell the VOC's (granted, I don't run the unit everyday). Which leads me to my next point, the controls. On my unit, there is control for WIFI (completely unnecessary in my opinion, and also had to figure out how to turn off the feature all-together, somewhat tricky), and speed control, and a light that indicates filter life? Or quality? Not even sure. The speed control is all that matters. And there are 3 speeds: 1) extremely slow (does this even do anything?) 2) slightly faster (I use occasionally, but almost feel the same as 1) 3) 3x as fast and loud as option 2. There is such a huge gap between 2 and 3 that would certainly be usable in my opinion, and instead I have to chose between not sure if doing anything (2), or super loud and probably too much (3). Very annoying! And thats the whole unit. Nothing else to say about it. Its now an oversized unit for my room, that gives me very limited controls. I could have built an air filter myself for way cheaper and would do way more. I am considering modding my unit to install a variable speed knob to control the speed of the fan. That should be standard, not a 1 2 or 3 option. Not very impressed.

Disappointed at this price point that it doesn't have an air quality monitor and automatic setting. I bought it after reading that this brand was good for smoke, but it doesn't come with the smoke filter either and they charge a lot for the filters. I have another brand that has the monitor and automatically adjusts the speed to the air quality. This one has three settings. Two are very quiet and the third is too loud. It would be nice to have one in between. The website steered me to this model for the size of room I have. Looks like their smaller units may be better.

I bought this purifier about a month ago and so far so good. I would likely never have purchased it if it had not been such a good sale price. The positive reviews and several articles recommending these purifiers were also helpful in my decision. I wish I could say that our air quality is greatly improved, but I have no way to really measure this, so I am simply assuming that it is doing its job properly. I would like it to have built-in air quality detection, as our previous purifier did, but I know that this model was less expensive because it is missing that feature. So we just leave the unit on all the time rather than have it come on when the air quality is low. It is much too loud to use on level 3 for very long, and it shakes when it's on that level, so I only use it when I know that there is something in the air that needs removed quickly, such as smoke. Normally it is set on level 2, as level 1 is so low that I wonder if it is accomplishing anything. Level 2 sounds like a small fan is running, which is acceptable in our home. I like that it is mobile. The casters make it easy to move anywhere in the house, but truthfully, it doesn't get moved often. I tried to use the app, and it seemed to work at first. But it kept getting disconnected from the wifi and had to be set up again repeatedly. Each time it seems to be fine, and a day or two later, it's forgotten how to connect. Too much work for an unnecessary feature. I didn't contact customer service about it because I have a life. If I have a free day, I might.

Smells toxic, like chemicals burning in filters. We will return

I bought this an old model and is still working,so got another one for more good air inside during pandemic!

I bought 2 for the office, 1 for home, and recommended others, level 3 is little loud, level 2 is OK, super affordable.

Large and loud in high. Looks more industrial in person. Might be appropriate for an office. It does clear the air quickly on high. I can't get the blue tooth to work.