Expo will make your airplane fly a lot smoother and will make it look a lot more under control. The movements will not be as jerky and it will be more predictable. I set up a switch so that I can adjust the throw during flight. However, expo is programed into either switch position, the percentage of the throws are just different. Maybe as I get better I will ween myself off of expo, but as for right now I really like it. I guess it just depends on how you like to fly. Anybody can make a plane go crazy in the air. Whats impressive is doing it and looking smooth.