The air filter works well and is easy to use. The directions are also easy to follow. The device is nice looking and I love that I can pick the color of the fabric color. I tried to order a fabric back up in case it becomes soiled and accidentally ordered a size 311. Their customer service didn’t catch this and I will have to exchange. However, they don’t make returns very easy with links to my order or customer service. So I feel that could be improved.  Please remember to double check that you ordered the correct size!