The best part about marionettes is that it provides an easy way for me in terms of UI design, development as well testing along side AngularJS by generating HTML templates from my angular directives without any hassle or extra dependencies required! I would like if there was some kind of option/plugin available so we can use our existing html template files in place instead creating new ones every time which takes quite long sometimes when you are working at high pace environment (like ours). So far no issues but definitely more features will be needed once its fully matured!! It's all good till now though - very helpful tool especially while developing applications where multiple people work within same team / project etc., also being able to test easily since everything goes through Karma tests right away makes this one hell lot simpler than writing unit-tests manually.