I have owned the Sharp FP-A80U-W for about 4 years now and I love this air purifier. Great middle of the road air purification buy. Not a $1,000 unit but not your Walmart $100 unit either. I have trouble with allergens and dust at night and I now run this in my bedroom every night. If I turn the purifier on before I go in, my nose immediately clears up as soon as I enter the room. The filters are a bit pricey, but very easy to change. I generally re-wash the carbon filters after a few months and extend the life of them that way. The HEPA one is supposed to be every 2 years. Really, no complaints, I just had to cover some of the lights with electrical tape since I couldn't shut all of them off (you can turn some of the lights off like the big Plasmacutter lights by holding the Plasmacutter button down for 3 seconds plus). I've enjoyed many nights of much better nose breathing sleep since buying the Sharp FP-A80U-W and highly recommend it for the price!