I bought this about 1 month ago and I really am happy I did. The only problem I have is how noisy it is. Somewhere it said it wasn't as noisy as the last model...but this is pretty darn noisy. Can't imagine what the older model sounded like.
First time purchasing one. My niece told me about them and I love my purchase. Works great and gets in all the hard places that regular brushing won't. Added cleaning and makes my mouth look and feel great.