Get yourself a mini cross-headed screwdriver and loads of bits. These tiny RC helicopters are just a collection of tiny fragile piecess flying in formation. Your helicopter WILL break. You'll have one too many "unplanned ceiling matings" or "unrequested wall/table/floor proximity violations" and it'll shear teeth of the gears, the lincages to the gyro will ping off and go missing, the gyro will snap or the cross bar linking the top blade to the gyro will shear a spigot leading to uncontrollable "toilet bowl motion" (an amusing name that perfectly describes the phenomena). But the darned things are so much fun to fly. For a few sheckles to buy the appropriate spares for when the inevitable happens, it's worth having them to keep these toys flying.
These helicopters are great fun, the contra-rotating blades stop the gyroscopic problems which are common to other makes. I don't really know about "educational value", but for fun-per-pound these are hard to beat. Another major plus is the availability of all the spares, and its well worth keeping a set of spare blades in a drawer- they're cheap enough- that said, I've had my helicopter for two years and still haven't broken it. This is more than can be said for my lampshades and houseplants though!
The only shortcoming of the things is the charging plug and socket. They stop contacting too quickly, and you can't charge up. However, unlike the Silverlit helis, with a bit of ingenuity, this problem can be solved by soldering two additional wires to the battery, and running these to the two tailboom supports. Cut the plug off the USB charger and solder on some mini crocodile clips instead.
All in all, the most fun you can have with your clothes on. Never put one away without a full charge (it'll kill the battery) and you'll get a lot of mileage out of a Syma! Great stuff! Just bear in mind that little kids and pets don't often realise how much whirring rotors can hurt.
The spares for this little heli are very handy to have when you own the s107g helicopter. The heli is really easy to fly and control but the odd crash still occurs. I bought these parts because I broke the little part at the top of the main shaft, these are available to buy seperately but the kit comes with a lot of bits and peices that can be used for repairs after many crashes. The spares arrived within a couple of days which I was very happy with.
Having experienced indoor helicopters for several years this Syma model is an eye opener. It is stable in flight and is very well made. IN addition a full set of spare parts are available should you have the inevitable sever crash! .