My children, 10 and 8, continue to enjoy this well built, safe, educational and entertaining toy for several years. There are lots of increasingly difficult circuits to make and the instruction manual is clear and comprehensive, from the simplest and the most complex. You end up learning a lot of electronic circuitry and this is more than ample to stir any curiosity. It is one of the very few "toys" that lasts (that said a small defect (crack) in the battery case was promptly replaced by the maker, painlessly). Fully worth the higher price and I wish the manufacturer did more of this class.