The worst trainer is one that will restrict your flying and learning skills after about the fourth or fifth flight.
The mfg make all of these flat bottom wings and the only thing they are good for is the first few flights. The best trainer is a good flight simulator program on your computer. A flight simulator will save you on the average about three airplanes the first year that you fly RC airplanes. And if this is true the flight simulator is free isn't it. I would like to hear some others comment on this comment.
If you want to see a what is a good trainer is, go to the thread about the Tower Kaos 40 and read. The good trainer is not the Kaos 40.
Lee