I really like that I can generate blocks programmatically, which allows (e.g.) select controls to be populated with values from the WP database rather than hard-coded.
It's also good to see that I can use the block values to generate a shortcode, which helps to make them easier for users to manage.
The templating system for output is neat, and like I said, it means that I can use my PHP/WP skills instead of having to rely on complex JS.
Thanks to the authors, and I look forward to seeing how the plugin develops.