My brother went from a Thunder Tiger trainer 40 to a Big Stik 40. He could take off and land without assistance but was still very new when he crashed the trainer. He tried first to get an Avistar but it was out of stock everywhere, so he bought the Stik. The first flight scared the heck out of him. He didn't crash but it was wild. He had to add quite a bit of nose weight, and reduce the control throws a lot, to be able to fly it. Over time the nose weight went away and he maxed all of the throws, but it was a wild beast (in the beginning) compared to the trainer.