Maturity: The bugs of Nebula 2 were gone; the engine was stable (v1.3.5).
Developer Prowess: Third-party developers like CDSoundMaster, AnalogintheBox, and AlexB had mastered the art of library creation.
The "Full" Advantage: In 2013, libraries were sold as complete suites, not micro-transactions. A "full" collection meant you had the complete signal chain—preamp, EQ, compressor, and tape—from single hardware units.