Because the wing incorporates washout, it will not tip stall. Knife edge is accomplished with no aileron correction and very little rudder input. Roll rate is very realistic at the recommended throws. Landing requires a long low approach - and a three point touch down. Most people think Gee Bees will be difficult to fly because they are short coupled.
Nobody seems to worry about flying-wing models though.
This is what is included in the Gee Bee Z kit.