I've used a number of electric toothbrushes over the last few years, but none of them were especially great. I was back to using my own arm power to clean my teeth.
Then this thing came along, and was a quiet revelation. I know that sounds stupid, because we're talking about cleaning teeth here, but this thing has changed the way I clean my teeth, leaving my mouth looking and feeling clever than ever.
So basically, it's a sonic toothbrush, which means it vibrates at a very high speed. The best way I've found to use this is to move it slowly around your mouth, allowing the brush to do the work.
What's really nice though is that it features a built in 2 minute timer. Turn it on, and start brushing one "quadrant" of your mouth (eg. bottom left). Then after 30 seconds, it will beep, and you move onto the next part. And again. This encourages you to brush your teeth for a full 2 minutes every time, and spend an equal amount of time on each part of your mouth. Simple idea, but highly effective.
The battery lasts a good while for me, a bit less than two weeks, and the charger is inductive, meaning you don't plug the brush in, you just sit it on the plastic plinth and it charges. Safe, and clean. No changing batteries, or risk of electrocution.
My mouth is cleaner than it's ever been, thanks Oral-B.