CoEs can be designed modularly with several options, allowing CoE adapting project teams to take on only the processes, artifacts and tools they need.
CoEs also promote continuous improvement, as key metrics relevant to the firm are designed into the CoE. The metrics allow the adapting teams to gauge their improvement. CoEs promote best practices and provide a repository for best practice documentation and reporting.
All-in-all, CoEs provide a well-managed path to success for the CoE adapters. Good CoEs are staffed with SMEs or provide access to SMEs. If tools and products are involved, the CoE provides education, support, and tool and product best practices. I find CoE invaluable for successful implementation of products and processes.