NoteFlight, even in its current beta state, appears more than capable of enabling composers to create musically expressive scores that play back with a relatively small palette of sounds (which will undoubtably grow)... all a very good to get us on our merry way. I found note entry to be amazingly easy. I'm a Finale user - and although I've dabbled with other notation tools, I'm pretty much all thumbs with them, even if they are great. Yet I had no problem getting started with NoteFlight.
No longer chained to the basement!
There are numerous "would be nice" features on NoteFlight.com's forum, but of particular interest to me are the import/export features. (Because eventually, all paths lead back to the basement for me!) Currently NoteFlight allows importing of files via MusicXML - and exporting to MusicXML appears to be a planned feature too! I can hardly wait!