I have one of those dragonflys @ home that our CEO gave me for Christmas It's pretty fun, and my little dog hates it! I'm not sure to the strength of it overall... I've only flown mine a few times becuase it gets kinda boring after a while

There are several small & thin plastic gears that make the wings flap.. not sure to their longevity.

That aero ace jet at least I can attest to its durability. It does however fly best in a large yard or local gym.