Ok, no you can't make your own missions in the demo, or why would anyone buy the full version? (oh yea, online action...) I had lots of fun with it though, and made many interesting missions...

There is ONLY an editor for F Korea, while F18 3.0 DOES NOT have any editor.

Get F-18 Korea for sure, as many things that were either a patch or not fixed in 3.0 are standard in Korea, while you also get the editor, 3DFX Voodoo1 support, Voodoo2 with the patches, many addon packs, jet skins, Gulf War campaign (see Pretzel), and user made missions, and I think maybe even OpenGL patch may be on the way (but find out first if you don't use a 3Dfx anymore).

I personally am waiting for the new Janes F-18, but it seems some time away from now. If you are rich or just need something new, go ahead, but if you are very critical of every sim out there, don't pound on these guys. they are among the last of the small flight sim companies.