FS9 is too old and looks really bad by today's standards. FSX's performance is no longer an excuse (unless you can't afford a decent PC), so i see no reason to stick to FS9 now.

Last time i loaded FS9 and looked at the "sea" simulation i just pressed CTRL-C and tried to erase the image from my mind  :-?

I hope Flight will be as stunning as it looks on previews and that it makes proper use of the video card as well as multicore processors. FSX might be the best we have right now, but i wouldn't mind BETTER  ;D