It's nice its whole environment can be installed from the web and works offline as a WebApp. The setup is frictionless, even in machines where you lack administrator privileges. It inherits a lot from Smalltalk, another positive point for me. But last time I checked the documentation was quite confusing, making a bit difficult to go much beyond "Hello World". It appears it was not fully updated after the implementation was migrated from squeak VM to WebApp.
