5 reasons to switch to FSX:
1. It runs well on modern hardwareI get a consistant 45fps (which is what I lock my frames at), drops to low 20's around airports. And that's with sliders up full. You could buy my CPU, graphics card, motherboard and memory for less than $1200.
2. Lighting and texture effectsThe bump-mapping and specular lighting and texture effects are amazing, and you don't need hundreds of dollars of add-ons to make it look good - I took this screenshot and I have no add-ons (apart from the repaint).
3. Online playI don't have to lock my frames to play online - either as a pilot or a controller, and without having to join a network. And I can fly with a co-pilot too.
4. Most add-ons now have an FSX patchSo you can take your favourite FS9 aircraft or scenery package and run it in X
5. MissionsThere are a lot of well constructed and realistic missions, both default and 3rd party. Tthe chopper missions are a great challenge with the winch (it's fun even for a fixed wing fan like myself).
Add 6: The King is dead. Long live the King