No sim model will fly EXACTLY like the real thing - there are too many variables.

What I have found is that RealFlight G2 is probably the most realistic sim out there.
The GENERAL FLYING CHARACTERISTICS are reasonably close. When you start getting into manuvers that are beyond the usual loops and rolls is where the problems come in. The physics in the program are good, but far from perfect. If you are trying to do an unusual manuver, the program will give you a GENERAL IDEA of how well the plane will do. If you want to sit down and program ALL the parameters and specs of YOUR PARTICULAR PLANE AND ENGINE into the program it will give you a much better idea of what will happen.

The purpose of a sim is to allow you to practice various and different manuvers under different conditions (use the weather for wind, direction, gusty, etc), also set the program for its highest "realistic" setting. It will give you a pretty good idea, but that is all.