Some electric toothbrushes go up and down. Some just vibrate. The Rotadent Countour goes in circles. If that's how your dentist told you to brush, or it just happens to fit the brushing style you already use, the Contour is a candidate for your next toothbrush. (Of course, you could always just move your existing vibrating toothbrush in circles, but where's the fun in that?)
Rotadent is a relative upstart compared to electric toothbrush giants like Philips and Oral B, but the circular motion of the Contour helps them stand out in a fairly crowded marketplace. The Contour uses a rather novel brush head, which spins rather than strokes up and down. (You'll have to provide the up and down strokes yourself.) Rotadent stays it will remove plaque both above and below the gumline in only one minute of use, which is one less than most electric toothbrush makers recommend. So if you're in a hurry to get your teeth brushed, this is for you. The Micro Access bristles are 1/3 as thin as ordinary toothbrush bristles, letting them slip into pockets where most brushes can't go.
It runs in two modes, Clean and Gentle. The first will presumably give you a powerful brushing while the second will give sensitive mouths a break. Rotadent says it will remove 92 percent of plaque in that first minute of brushing, so one assumes you can keep on going in an attempt to get all the plaque off your teeth, though there will probably be a point of diminishing returns. The company says that the battery will run for three weeks without charging, making it a good choice for frequent travelers, and it has an ergonomic handle to make it easy to grip without developing tooth-brushers cramp.
While you're shopping for an electric toothbrush, also look at the Panasonic EW-DE92, the Foreo ISSA and, for a combination of electric toothbrush and oral irrigator (i.e., robotic flosser), the Waterpik Complete Care WP-900.
More difficult to use...I haven't been able to find a toothbrush that cleans my teeth as effectively as this one does, no matter how bad the quality of the product is.
It is the only brush where the head rotates in a full 360 degrees. Although the other round style brushes appear to rotate, they simply oscillate back and forth.
Never had major problems but with all my Rotadents, my teeth and gums (especially) are in perfect shape. Was never so with Sonicaire, or Oral B before that.