the hardest GA aircraft to fly

Remember, I know everything about GA flying. The easiest airplane to fly is the Ercoupe and all it's descendants. What is the hardest? If you've never checked out in a tailwheel airplane, then all tailwheels are the hardest. You know what I hear a lot is "All airplanes fly the same whether it's a J3 Cub or a 747". Airline pilots always say that. But that's not saying anything. The easiest airplane to fly is the airplane you fly every day. The hardest airplane to fly is a tailwheel twin Beech with turbine engines, a so called "Kerosene 18 ".