I am not finished with this piece yet, but I there are two things I worked out here that show how much better GPO and GIO are than other similarly priced libraries. First I used some fading techniques on the choir. I used GIO silvery choir and GPO Ohhs then faded to a GIO silvery choir with different tweaks and GPO Ahhs. This made a nice effect that make the libraries sound much richer.
Also, I have an aggressive and repetitive string part that suffers from machine-gun effect on all my libraries but Garritan. This string technique is hard to make sound real on other libraries but sounds great here.
This is for a Game/Film genre, but gives you an idea of where it is going. The flute is a live Native American flute I picked on vacation in Tombstone.