Wow. Thank you for remembering. I started out with a Silent Master years ago, way before I moved to St. James to run the vacuum museum at Tacony Corporation. At that time, the machine had a single ply disposable bag liner for the cloth bag. I felt it lost airflow fairly quickly. After owning it for less than a year, my friend and central vacuum guru, Owen Perkins, traded with me for the Vacuflo 99. I was perfectly happy with it for years, until I got a sinus infection emptying it. It’s a long story, but you have to be willing to be covered in dust if you own that machine when you empty it. The new Modern Day Silentmaster uses the True Seal HEPA disposable bag. In no way can I get dirt on me when I empty it. My good friend Evan Rogers, when he installed it, was kind enough to leave me two HEPA bags. When the day comes that I do have to empty it, at least it will be a sanitary convenience, and I will not have to pay for a doctors visit or antibiotics due to emptying a central vacuum again.