Searching companies that migrated from java-based webframeworks to Rails

Hi guys,

I have a client that is interested in switching from a java-based
webframework to RubyOnRails. The client develops a webbased-platform
with 10 java developers.
Right now the client has still some doubts if RubyOnRails is fully
able to substitute Java.
To help him with his decision we are now searching for other companies
in Germany, Austria or Switzerland that have made the switch and would
be willing to share
their experience.