DT
I am so Smart! S-M-R-T!
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- Aug 18, 2020
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We've been using them for a couple of year now, and have been updating our units, moving existing to other rooms, replacing with newer ones. They really seem to help with the general air quality, sinus health - plus provide a source for some pleasant white noise 
We've only used BlueAir, but I had a good price on a COWAY come up, they've been well reviewed in terms of price and performance, but I do see a few comments about poor CS, especially when it comes to warranty. I ordered when I saw that good deal on Amazon, but I think I'm going to cancel (or attempt to, or send it back unopened), because I hopped over to the BlueAir site and see several of their products are on sale 50% off direct, in particular, the models for larger rooms and more effective filtration that are basically the BlueAir competitive product to the COWAY (both have a 5 year warranty, it's just a question of getting it resolved if something does go wrong).
We have a couple of 211+ and 411+, and now, assuming I don't stick with the COWAY 400S, looking at a BlueAir 680i while they're 50% off.

We've only used BlueAir, but I had a good price on a COWAY come up, they've been well reviewed in terms of price and performance, but I do see a few comments about poor CS, especially when it comes to warranty. I ordered when I saw that good deal on Amazon, but I think I'm going to cancel (or attempt to, or send it back unopened), because I hopped over to the BlueAir site and see several of their products are on sale 50% off direct, in particular, the models for larger rooms and more effective filtration that are basically the BlueAir competitive product to the COWAY (both have a 5 year warranty, it's just a question of getting it resolved if something does go wrong).
We have a couple of 211+ and 411+, and now, assuming I don't stick with the COWAY 400S, looking at a BlueAir 680i while they're 50% off.