So I'm still slowly chugging along playing with Angular Dart.
The thing that's bothering me now is, because the it's such a new language/framework, is the lack of decent UI stuff. I needed a pretty date picker for my test project. I could either use the HTML5 date picker which isn't supported in half the browsers out there, or write my own. I guess I could alternatively import all of jQuery and figure out how to get Angular Dart to talk to a jQuery widget. Ugh. I finally found someone that had written one using WebUI, a deprecated system for making widgets in Dart, and managed to port it over to Angular. (if you are reading this and need one, email me!)
Tonight it was an autocompleter that I needed. Again, I ended up spending awhile converting a WebUI widget. Which is great practice for learning a language and framework, so I'm not complaining too much. But it certainly cuts down on the productivity.