Pull on one string and they'll quickly turn and fly in that direction. More interactive than traditional kites, they can loop and dive at speeds of 60-MPH or more in strong winds.
Stunt kites come in easy to fly beginner models up to advanced radical trick kites.
Big wings develop lots of power, sometimes dangerous amounts in strong winds. As with many sports, that's part of the fun. Just remember to enjoy the power of the wind without underestimating it. They're also fine for beginners who want to invest more money and effort in exchange for greater performance. Move it forwards or backwards and stop wherever you choose.