Nice video demo.

I spent some time using mocl last June and wrote about the experience (http://markwatson.com/blog/2013-06/interesting-product-mocl....) - very cool tool.

The sweet spot for mocl would be, I think, apps with relatively simple UIs, but with a lot of functionality that you wanted to implement in Common Lisp. My reason for this opinion is that mocl lets you create both Android and iOS (and now, I think, OS X) apps but the UI is specific to each platform. You would get the most benefit if most of the complexity in your project was non-UI code that could be reused across platforms.