I personally would rather recommend one of the Finale products, most publishers will accept notation in Finale whereas I am not too sure about Noteworthy.
I already have Finale 2006 full version, but can recommend their much cheaper Print Music, it has most of the important bits that the full version has.
As a trial I downloaded the Noteworthy evaluation version, which I can honestly say is quite good, it does do a lot that Finale Print music can do, but I do have a few minor points against it.
Note entry, although fairly simple is a bit less easier than Finale speedy entry, you have to press the enter key to actually put the note on the staff. I couldn't find a way to make a bar line appear automatically after four beats in 4/4 time, you have to place it manually. Note length can be accessed by the number keys, but they work in reverse order to Finale, the higher the number the smaller the note in its order, from full note, half note, quarter note, one eighth note, etc Finale works the other way round, the lower the number, the smaller the note.
I don't play keyboard well enough to tell how good it is at real time input from a midi controller or ordinary midi keyboard, so can't comment on that aspect, and haven't even looked to see if it exists in Noteworthy yet, as I am happy with my own Finale. However for someone wanting to just use a notation program to produce sheet music for other musicians to play from, Noteworthy isn't that bad if perhaps a little slower to use.