My 6 year old son loves using this toothbrush. He feels all grown up, as my husband and I already use the adult version. You end up brushing your childs teeth better (and more focused) as it is on a timer with a musical bleep telling you when to move onto the next part of the mouth, so it makes sure you spend enough time on one area. My son's teeth look great - that said, he brushes his teeth on his own in the morning but I do them in the evening.......just in case he isn't following the brushing rules! We bought this at half price and are very pleased with it. After spending up to £10 a go on musical toothbrushes that didn't last very long and didn't do a good job, this is a welcome change.
We also tried this on our daughter who is nearly 3, but she didn't like it saying it tickled too much. Funnily enough it also tickled for my son, but he was happily to perservere with it and now uses it with no problem at all.