It's awesome to be able to change your own filters. The company I got it from wanted to charge me $300. To change my filters and also charge me for a 45 day loaner that comes out to $150. + Depending on how long it takes them. The machine is covered under the insurance but the filters are not covered. But they want to charge up to $500. A year to change the filters. I don't think so. My medical outlet saved me money and I didn't have to wait for my portable oxygen machine to come back to me and pay for it loaner. Thank you and God bless.