I second what Nike mentioned. I've been using a Sonic Brush for a while too, and it has definitely made a noticeable difference in my oral hygiene. The high-frequency vibrations effectively remove surface stains, and I've found that my teeth feel smoother and cleaner after using it.
Another advantage is that Sonic Brushes often come with multiple brushing modes, so you can tailor your brushing experience to your needs. For example, there's usually a sensitive mode for those with more delicate gums or teeth.
However, as User_2 mentioned, the cost can be a factor. Sonic Brushes tend to be more expensive upfront compared to manual brushes, and you'll also need to factor in the cost of replacement brush heads. Still, if you prioritize your dental health and want a more efficient and convenient way to clean your teeth, I believe it's a worthwhile investment.