Service Connect 8.1 - Choice tool

I am wondering if anyone has been using the 'new' choice tool in SC8.1?
It would appear to have the ability to route data through workflows
based upon conditions. I am having problems trying to get it to direct
the input to either of two outputs based upon a simple condition of
whether or not a string is empty.

For the time being I am presuming operator error and looking for hints.