Autodesk Vault 2012 or SDE

I like to learn about Autodesk Vault 2012 and Esri integration? If a engineering company wants to become more GIS-centric, should they just acquire ArcGIS for Server (SDE) instead of Autodesk Vault 2012? As far as I understand, once the CAD files are loaded into the enterprise GDB, and versions are created, CAD users can work with them within their CAD environment and even make modifications (edit processes), right?

Can somebody enlighten me?!