In my opinion, there ARE no weaknesses, only design intentions. This is a trainer and as such, it has all the inherent qualities to make it EASY to fly. It gets easy for you to fly it, you might like to do more advanced stuff with it, like inverted flight, hovering, rolling circles, etc. With the dihedral in the wing, these things are tough to do. Mine was a kit and had a lot of dihedral so, we built another wing with much less dihedral. Now, it'll do a lot more and is a heck of a lot of fun to fly, and, I still have my other wing if I want to instruct someone on it. I can change the wings in seconds. I've got a 91 4-stroke on it and have a ball flying it.