modellwerkstatt.org in Innsbruck, Austria use MPS to develop powerful DSLs for building enterprise applications. The whole development process is realized with MPS. Watch this two-part screen-cast to get a taste of what MPS brings to the table in this particular domain.
You may also like to watch the second part of the demonstration.
The screen-cast was originaly posted at http://www.modellwerkstatt.org/videos