I have a brother who has built his own 2-seater single engine kit airplane. And I have 3 kids, ages 7, 5, and 3, who love turning two dimensional sheets of paper into 3-D flights of fancy. The Power-Up 2.0 module has opened a whole new 4th dimension.
I bought the powerup 2.0 and the 4.0. I thought they we both fun to play with once we got the plane aerodynamics working well. Both planes were able to maintain a decent about of time in the air. Be careful on days with a moderate breeze as you will lose control of the plane and the wind can take it far away (like 150 yards on our first flight)