I built a 120 and fly with the DLE20. Its adequate but not unlimited. It also weighs over 13 pounds. The DLE30 RA would be a much better choice as it will offset the extra tail weight with the elevator servo in the tail. I put it back there for better control, less deflection since the pushrod is short. The rudder is pull-pull, and I shortened the wing by one bay each side. I also put rounded tips on so it wont catch in the grass if I drop a wing on landing. I also put the fuel tank on CoG, so it balances full or empty.