The other features such as the "shared composition" aspect could also be very useful in classroom settings where collaborative learning is taking place. The teacher, as well as other students, are able to see what their classmates have composed and possibly provide feedback on his/her composition. This is a great way for students to learn from their peers while also improving their own composition/arranging skills.
Check out my link to the song "A Bicycle Built for Two" that was part of this week's assignment in my "Technology for Music Teaching and Learning" class:
Noteflight Example- "A Bicycle Built for Two"
If you've never tried the Noteflight software program, give it a try!