It has been very helpful. Once I received this {along with my percussion vest} the secretions in my lungs began to loosen. My pulmonologist gave me a script so it was covered by insurance. I did have a co-payment that was broken into payments. It has four cycles where you simply inhale and exhale for two and then two of the cycles pulsate so it is a little more forceful for your nebulizing solution to go into your lungs. Each cycle lasts 2 1/2 minutes. It has tubing that has to be replaced every 90 days but Hillrom has been very easy to work with and respond quickly to calls and mailing out the tubing. My insurance covers this also.