well samolot, I'm going to give you an opposing point of view. The aircore trainer is heavier and lands hotter (faster) than balsa models, so if you're working on landings, I dont recommend it. Crashes can damage the lite ply plate that the motor and electronics mount onto. This can be replaced. A Balsa model can also be repaired, unless you really plant it in the dirt. I found the aircore a real pain to build, particularly the wing. Building a balsa ARF is probably easier. If you are reasonably proficient at landing a primary trainer, then an Air core makes a nice back up model, or a half step up model. There are so many better choices though that I don't often recommend this model line.

peter