We did a lot of research on air purifiers and wasn't sure which one to get. We were shopping at target and saw this air purifier and decided to give it a try. We are happy with this purchase. This air purifier works well. It has a filter that you can vacuum so you never have to buy a new filter. There is a pre-filter that does need to be replaced but it's quite cheap to replace it. We've had this air purifier for a year and haven't needed to buy a new pre-filter yet. the air purifier worked great as a white noise machine for our son when he was first born. It created white noise but it wasn't loud or annoying. This air purifier doesn't leave any strange chemical smells that other reviewers have mentioned. This air purifier is small and compact and fits nicely in small spaces. We like that there's a handle that you can use to move it to different rooms. So far we haven't had any problems with this air purifier. We highly recommend it.