I had been using my cpap machine for about 2 weeks, and needed help! I didn’t get my machine through cpap.com, and didn’t have enough education from the company that sold it to me. Mark answered my questions, and answered more that I didn’t even know I had until he brought them up. He helped me with: * Fitting my mask/cushion to that it is most comfortable and effective * What to expect as I get used to the machine and masks * Hose care * Common user problems and how to fix them, and more. I would highly suggest that a new user contact Mark the day they bring their machine home. I could have avoided 2 weeks of frustration if I had only known what I know now. He is knowledgeable, patient and kind.