Today I received and installed the upgrade from Sibelius 3 to 4 as well as GPO Sibelius Edition. I am quite impressed with the software after first use. It is much better than Kontakt Gold. I know that when I was contemplating buying the software it was very helpful for me to hear samples from Sibelius itself. I already knew that GPO sounded brilliant, but I wanted to know if that stayed true while being played from Sibelius.
I've posted an MP3 of Sibelius 4 playing Beethoven's Symphony No. 6 in F, or the first two minutes at least.
I made no modifications at all, I simply imported a MIDI file I got from online and set the sample collection to GPO Romantic Orchestra. Every single setting is default (reverb is off) so this is how it sounds out of the box.
It sounds pretty well until the very end, when it goes a little crazy. I think that I'm using more instruments than I'm supposed to with my amount of RAM during the climax of this piece; I'm sure there are many ways to fix the problems associated with high poliphony (besides buying more RAM of course!), but overall I'm very impressed and excited with what I have, and out of the box as well.
iMac G5 1.8Ghz with 1024 MB RAM running Mac OS 10.4.4
I can give you more information on my machine if you so desire:
MP3 Link: http://www.connorfabiano.com/misc/pastoral.mp3
I hope this helps: