If you are hesitating about introducing OSGi to your company/department, please consider the following benefits:
1. Access control
Internal packages can be easily refactored without breaking any API, which reduces development cost.
This prevents failures due to incomplete or incompatible class space, which reduces maintenance cost.
OSGi components explicitly declare and expose their capabilities.
This makes them easily reusable, which reduces development cost.
Components of an application can be deployed into one container, or into multiple containers (even onto multiple hosts).
The service layer will automatically wire up the application (using proxies for remote components), which reduces development cost.
5. Hot swap
OSGi components can be installed/updated/uninstalled without stopping the application.
This shortens feature delivery time, while lengthens up-time, which reduces operational cost.
OSGi is supported by a strong community as well as large computing companies: Oracle, IBM, Samsung, Siemens, Deutsche Telekom, Redhat, Ericsson, and many more.
Good and responsive support channels reduces development cost.
Please visit the following page for a more complete list: http://www.osgi.org/Technology/WhyOSGi
(This article is meant for top managers with limited time, being responsible for a significant budget. If you know similar two liners, please don't hesitate to add.)