I have owned a Kirby Heritage II for almost 30 years, it was a great vacuum that needed very little maintenance, just replace the bag when full and a belt every few years. I also believe I replaced the roller twice. Alter so long I decided to see what the new model can do. I called Metro Rhino Distributors and spoke with Artis. I told him that I was not sure if I was going to purchase the new model or not and that I was very happy with my current Heritage II. He was very polite and told me he could show me the differences and be at my home in an hour. I said okay and he showed up right on time. We cleaned an area with my Heritage II and then with the Sentria II. I was amazed that the Sentria II actually pulled more dirt out of the carpet than my Heritage II! I also liked that new TechDrive, it made moving the vacuum on carpet virtually effortless. My wife was also very happy with the Sentria II so we purchased it from Artis. The presentation and paperwork took about one hour and was a pleasant experience with no pressure. I am very happy with the experience and my new vacuum.