I already own the Mary Martin/Broadway album, so always resisted buying the movie soundtrack. But I couldn't resist the expanded score in this edition. Besides finally having "Something Good" (unique to the movie), I now have much of the background music.
The only thing that disappoints me is they've removed some of the spoken lines within songs. One example--in "Maria" when Sister Margaretta sings "I'd like to say a word in her behalf." they omitted the Reverend Mother's reply, "Then say it, Sister Margaretta." For those who have grown up with the movie and know it and love it, it's a bit of a jar, an emptiness of something missing that should be there.
But that's a minor quibble, one that many listeners won't notice or miss. And the expanded songs and music do make up for it. So even if you already own a SoM soundtrack, go ahead and get this one. It's worth it!