I got my sleep machine from Sleep Rite back in '07. They change it every three months which can get pricey, even though we have insurance. I've been very good with the maintenance which is why I don't have problems with it. I get a mask every 14-15 months and they send me flyers when it's time to change it. I've been very happy with the service, and the inhalation therapist is a very conscientious young lady.