I would highly recomend the Avistar and the .40la enigine I have them both and I can even get my Avistar to hover, I have never had a bit of trouble out of my engine. The good thing about the Avistar is that it is a more aerobatic trainer ad you can do alot more tricks with it better than a basic trainer. I had a guy take mine up and showed me that it would do snap rolls and knife edges.