I wouldn't spend my money on that when you can get an excellent freeware rendition by Mario Noriega (sp?) - I know for sure the file is over at avsim. Just make sure you get the FSX recent version (I believe it's 3.0).
There's no working FMS but if you own RXP GNS you can put them in. There are, however, well modeled systems and engine failures etc if you treat the plane poorly.
I highly recommend the freeware version.