Review (4/5): Great, Although Expensive, Electronic Toothbrush
I found the Oral-B Smartseries 4000 Rechargeable Toothbrush to be very comfortable in my hand, not too heavy, and very easy to manipulate in my mouth. I also liked the various settings and often used the "Daily Clean" setting in which the toothbrush stops and beeps so that you get the proper amount of brushing in all 4 quadrants of your mouth. As I have sensitive teeth, I also liked it that the toothbrush has a pressure sensor in order to keep me from over brushing. My old toothbrush was the [[ASIN:B003UKM9CO Oral-B Professional Care 1000 Electric Toothbrush]] and the Smartseries 4000 obviously has many more options and advantages over this brush - but is also almost twice as expensive.
Overall it's a great toothbrush, should $100 be within your budget to spend.