I understand that Oracle GlassFish Server 3.0.1 product is the open source Glassfish + branding + some closed source components.
Is there any technical reason to purchase the commercial version? A JRockit license? Surveillance tools? Integration with other products?
EDIT: Personal experiences with the commercial product is highly valued.
As it was the case previously with Sun, Oracle offers GlassFish Enterprise Manager, a set of additional features for production, to its customers (now those acquiring Oracle GlassFish Server). You can get an evaluation copy of these additional feature at http://oracle.com/goto/glassfish
Other reasons to use the commercial offering include support for the JVM (Hotspot and JRockit) and patch releases for GlassFish (follow these on https://blogs.oracle.com/glassfishforbusiness)