Unfortunately, very buggy atm - ie., 'alpha-quality' software. Auto-quits when opening some of their own built-in templates, freezes when adding some components, and visual glitches with the toolbar on full-screen mode (all picked up within 15 minutes of using the app).
It does, however, look very interesting. If the developers spend enough time and resources, it could become a very helpful piece of software, indeed.
Lastly, as with all other CoffeeCup software, this app's interface is somewhat clunky and unintuitive. The app expects a certain workflow from you, and that you will adopt some of its conventions. You will not be able to guess what these are, or make things work simply by 'discovery play': you will have to RTFM, and spend some time learning about the app itself.