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I am currently learning Sibelius 5. I really wanted to get to grips with some notation software because it was getting very inconvenient writing parts and as I am planning some orchestral recordings next year, I really wanted to concentrate on writing the music iself, rather than copying parts or waiting for copyists.
Sibelius is a really nice program and even plays back the music interpreting the text and musical marks as it plays through. Seems a bit like cheating to me :-) and I'm going to miss taking a break to sharpen my pencil, but it produces very readable music in very quick time.