A problem with doing unusual attitude, stall, and uncontrolled flight training is simulators is how well the simulation represents the real world. In general, it is probably better to do training like this is the sim than to have no training at all unless the result is "negative training" in the form of giving the crew the idea that they can do something in the a/c that they in fact can not.
The sim itself can only do what it is programmed to do, and it can only be programmed with a good quality simulation when there is data available from the real aircraft. The products of the aero engineer's art provides indications of how the a/c might perform but remember that the equations describing the performance of the a/c become discontinuous at the spin entry. The predicted performance on the basis of the design are also okay only for relatively steady state configuration, speed, attitude etc, and don't tell you very well what happens over time when you make a particular control input or configuration change. In other words, don't trust the simulation the farther it gets from the tested flight envelope.
That said, I would bet that in a well built and well maintained (not tweaked all over the place) sim the barrel rolls and such would go pretty much as they would in the real aircraft.