Flight Simulator Games have to keep on top of the changes in the aviation industry and with their competitors in order to keep their customers happy. In fact, a couple of really good flight simulator games are actually used by the aviation industry to train their pilots. So if these games were not almost exactly like the real thing, there would be no point in using them.
My advice is that you really take the time to find out what there is out there. Read the fine print, read reviews and most importantly compare your final list of flight SIMs to each other. Some features might not be necessary for you, while others might be exactly what you are looking for.
Before you buy flight simulator games make sure you also know what your operating system is capable of handling.