Seeking an expenses customer for a 1:1 conversation

Summary:

I'm looking for customers that implemented Expenses in ‘big bang’ approach with great volumes vs incremental implementations. How did it go?

Content (required):

I have a customer who is wondering which approach is best to roll out expenses, and would like to talk to a customer who has been there, done that.

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):