GPO and the Solo Strad are used in this, the violin is used to support the strings passages and give them a subtle legato feel, though I probably mixed it too low as it is not very noticeable. The main brass is SO Silver, with supporting brass from GPO. Horn is VSL. Percussion is GPO, SO Silver, and percussion sounds from my keyboard. Actually, most of the flutes are in fact GPO, mixed ensemble as well as the solo v and nv. There are staccato flute motifs here and there that are not GPO however. The main strings are a mixture of GPO and some custom strings from my keyboard. Main harp is GPO as well except for some glissando parts.
Most of the time for my music, GPO will be filtered through a saturated reverb and EQ. I almost never use a single library exclusively as so far I have not found one that satisfies my tastes 100%. I like most of GPO except for the brass. I like the brass in EWQLSO, but many of the sounds are actually a bit too diluted IMO. Every library has its strengths and weaknesses and I try to get the best out of them all, though it is often difficult to get them working well together, and the end result is usually something that doesn't really sound like any particular sample library.
Hopefully this clears things up a bit. I appreciate the comments, and I am happy to answer any more questions