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Gigapulse is installed as a part of Giga 3. The rest of the CD's (demos mostly) were okay. I wasn't real impressed with the included sounds.
Try going through the 24 bit files for VSL. There are some pretty nice keyswitch patches there. The harp, Bb clarinet, Flute, and strings have some really great sonic detail. I understand where you're coming from though. When I first got Giga 3, I wasn't too impressed. Incidently, which version did you buy? Orchestra? Ensemble? or Solo? orchestra comes with the most extra sounds. I worked on a complete arrangement last night (until 2am this morning...oyy was I tired going to work) using nothing but the bundled VSL sounds and a dash of SAM Solo Sessions (which totally kick ~~~).