Obviously there are no demo versions but here are a couple of comments that might help.
I also got GPO and was very disappointed with the quality of the samples but the interface was, at least, playable in a somewhat musical way without much effort. Then I got VSL Opus 1/2 and was disappointed with the playability of the samples (partly because Halion is such a piece of crap), but the sound was top-notch. My guess is that your experience with the Kontakt VSL library is similar. At that point, I started dreaming of a library that combined professional-quality samples with a playable interface.
Well, my dream almost came true - VI is now the most playable interface I have used. So, it now wins in terms of playability AND sound. It's not a panacea, though - you'll need a separate instance of the VI for every instrument in the orchestra, so it's a bit of an organizational nightmare. If VSL would change that "feature" I would say the library is darn near perfect.
rgames
I also got GPO and was very disappointed with the quality of the samples but the interface was, at least, playable in a somewhat musical way without much effort. Then I got VSL Opus 1/2 and was disappointed with the playability of the samples (partly because Halion is such a piece of crap), but the sound was top-notch. My guess is that your experience with the Kontakt VSL library is similar. At that point, I started dreaming of a library that combined professional-quality samples with a playable interface.
Well, my dream almost came true - VI is now the most playable interface I have used. So, it now wins in terms of playability AND sound. It's not a panacea, though - you'll need a separate instance of the VI for every instrument in the orchestra, so it's a bit of an organizational nightmare. If VSL would change that "feature" I would say the library is darn near perfect.
rgames