What are the differences between Presto Wires and Presto Mashup Studio? Do we need both at the same time or is Presto Wires sufficient for our needs?

For advanced mashup development, we find many organizations require an environment that support the declarative development of mashups.  Presto Studio lets mashup creators leverage all of the power of our Enterprise Mashup Markup Language (EMML).  For non-technical users, Presto Wires is a user-oriented mashup creation tool with a drag-and-drop GUI that has much of what many mashup creators need.  Wires is also extensible, allowing easy access to custom mashup macros created in Studio.