ORIGINAL: 3DFanatic
I've flown the SPA3D, they 3D poorly. The wing flexes too much making rolling harriers and such impossible.
The purpose of the SPA3D is basically to let someone get comfortable in a harrier or hover low and slow. It is one of the most stable harrier planes I have flown and for a newbie to 3D it will help build confidence and comfort.
Past that you are correct, it is not an advanced 3D animal. Just wanted to clarify what the airplanes mission was.