Review (4/5): Too bad it's discontinued
It is not true that there is a "newer version" of this product. Amazon should correct this misleading information. This battery operated toothbrush is truly a sonic toothbrush. The so called newer version, the "power up" is not sonic. It is the equivalent of the cheap automatic toothbrushes that you can buy at the supermarket--harsh on your teeth, noisy and not effective at reducing plaque. I made the mistake of buying it because I thought it was the equivalent of the Sonicare HX3351, which I have loved, and the battery operated feature is great for travel abroad. I have had three of them over about a decade--they don't last forever, but they are excellent while they do. Too bad Sonicare has discontinued this product!