Flight sim X is quite good, but unless you have all the kit, including a high powered graphics computer and the pedals and all, I am not sure just how much of an advantage it would be for VFR flying. For IFR flying it is good building up that scan and for practicing approaches, but then again there is no ADF dip, so that is another limitation. Never really tried any other PC sim, apart from RANT, but thats a different kettle altogether.