Looking at the construction characteristics of this plane, it has some very nice features which contribute to it's sport flying capabilities. First, it is constructed of "Aerocell" foam which keeps the weight lower, but this foam also has good strength which equals an airplane with good strength-to-weight ratio. In modeling airplanes, this is key to top performance. A side benefit of this foam is that you can easiely repair a mishap with regular CA glue and not have to use foam safe CA as I did, oops. Second, the model has an excellent ducted-fan system complete called "Hyperflow" complete with using an Ammo brand brushless motor. These motors are efficient and you then have a powerful, yet light propulsion system. The L-39 has good attention to detail with it's nice finishing scale looks and also some detachable armaments for when you have the plane on it's stand. The L-39 has easily accessed battery compartment with convenient magnetic latches. This is not a beginner plane. I would suggest some advanced trainer time before flying the L-39. It scoots along and will do loops and rolls all day long. I made one modification. I wanted to go with a slightly larger battery to fly longer so I needed to move the fan unit back a bit to balance the plane. I also added some extra protection on the bottom of the wing with some light ply strips to protect the aileron control arms. Thanks to Mike Dorna, who is launching the L-39 and later flew it so I could take pictures. This plane is a blast and for 99 bucks with the motor and fan unit a great deal. Here's a video of it flying.