My dad got me an Oral-B 3D Excel recently and IMHO it's definetly worth the 50 bucks he paid for it. I've used: ancient braun electric toothbrush, Inter-Plak, and manual brushing. The Oral-B is by FAR the best of any of the toothbrushes I have used. The small head combined with the motion is excellent at cleaning everywhere, even the hard to reach places. Also, it has a timer built-in do you know you've brushed for 2 mins as recommended by dentists, a nifty feature.
I highly recommend this toothbrush, the first time I tried it, I couldn't believe how much better it was compared to the other electrics and the manual.
-Ice