It's been reported several times, and there are notes in the README.txt about it already. If you really need to display a string, for the time being you'll have to implement a Ui.DataField and render the text yourself. There is one additional note that isn't captured anywhere; if you want to display a time interval you can return a Duration from compute() and it will be rendered correctly.
Thanks! I had a quick look through the posts but could not spot it. Did pick up that the current location stuff is not implemented yet in the simulator. Still was good learning curve to think you were coding it right but kept doing otherwise!
Anyway it is looking promising and coming from a .net background the language and concepts isn't that different.
