Our son has wanted for his 4.Geburtstag a "Monster Truck". After many unsuccessful attempts diverse monster trucks in the category up to 80, - I ended up with this. The children do not just careful with this unit to play sometimes without remote control, by as a Match Box car use it, go on the sofa, from which he then falls down, etc. But the Rock Crawler does this with everything. He may by the extremely flexible independently suspended wheels here probably as some put away, before something breaks off. The flexible suspension in connection with the wheel also makes him more than terrain. Over hill and dale, through the sandbox, in the forest, etc. This thing does it all. All other previous "Monster Trucks" have given up here already with a slightly longer grass. For a 4-year, the rate is more than adequate. So the children have a chance to practice steering without thunder straight to the next Cabinet. Furniture are very well protected by the large wheels and sturdy bumper and leave no trace. Battery life is fine (20-30min). Others can not even better. It is advisable nevertheless to set a 2nd battery, so the fun does not stop abruptly. Replacement batteries can be at any major electronics retailer to buy easily and who wants to tune the thing a little who buys a battery pack with 6 instead of 5 cells (also fits into the battery compartment). Lasts longer, gives more power and makes it a bit faster ...