I've never bought an air purifier before.I wish I'd known this was working so well.I'm impressed with the purifier.I have been using it for a month, because I live in a new house, I have some indoor air problems, slight and a lot of dust.I'm allergic to both, and I've been coughing ever since we moved in.There was a bad smell in the house.I don't know where it came from.The package arrived some time ago and we started to use it. It is simple to use and works well. So far I haven't encountered any problems.It looks good, too.I highly recommend it.