I got one about two months ago at the dentist's recommendation, and I'm beginning to wonder. I had to get it because I brush too hard and it was making my gums recede. I certainly am not going back to regular, because I'd prefer to have my teeth stay where they are, but a lot of times I don't feel like my teeth are that clean. I got a waterpik ultrasonic one, but I think its kind of misleading, because while yes, sound is vibrations, all the toothbrush really does is vibrate really quickly. I'm just wondering what people think of these, because apparently they're a lot more prevalent than they used to be.