When I purchased this toothbrush, I had never used a powered toothbrush before. It tickled my mouth and sent chills through me when I used it, so I set it aside and wondered how anyone could get used to this! But I decided to try again, and worked my way through the adjustment, and now I would not consider going back to the manual toothbrush. I believe it has made a difference for me. It cleans very well, and is great to use. The four quadrants is a timing plus.