I've met a lot of pilots who obtained their type in the LR 20 or 30 series, who believe that somewhere right around Mmo the airplane will begin to experience a sensational aileron buzz and all sorts of mach effects...because they experienced this in the simulator.
The real airplane doesn't do that. In fact, the airplane can exceed Mmo by a considerable margin before any such effects occur, and they're not nearly as pronounced as the sim. The effects experienced in the sim are exaggerated to make a point, but they don't replicate the actions of the airplane at those speeds. Even the mach tuck experienced by the airplane is very minor, and amounts to little more than a lessening of stick force below certification minimums...which is the reason for the puller and mach trim above .74 M.
You're quite correct that the high speed habits of an airplane very considerably with the design.