There is a huge difference in computer requirements between FS2004 and FSX but to me its not worth buying a new computer to run FSX. FS2004 runs good on the average computer and there is alot of downloads that'll keep you busy. As for helping in training, its good for visualizing things like procedures before embarking on the real thing. FS2004 is worth the buy if your computer is a couple yrs old and FSX is great if you have a good computer bought within the last year or so. FSX minimum requirements on the box is very decietful. Im staying with FS2004 till computers go down some more in price.