Access to the official TMS support forum is invaluable. The official engineers can solve complex architectural roadblocks within hours—a benefit lost without a legitimate license.
Disclaimer: TMS Software continues to release newer versions with excellent features. Always evaluate your specific project needs. But for legacy projects and hardcore debugging scenarios, 9020 Full Source is a masterpiece of its era.
The variant includes every .pas file, allowing you to debug into the components, modify behavior, and compile the packages directly into your executable without runtime BPLs.