I made the journey from inroad to off-road about two years ago. The biggest difference for me was driving style and the lines to take. In onroad you always want to apex and take the straightest line through to be fast, but in off-road you may have to go wider to gain better traction. i also think it was hard getting used to how the car reacts over not only jumps, but just changing elevation, especially like table tops mid corner and how to properly steer for it. With onroad being all flat you just steer where you want the car to go.