There were some bugs and support was great at working to overcome them.
There are limitations as well that could be improved including:
-(!important) allowing more control over date and time of auto generated events from categories (perhaps controlled by extra fields or at least, further controlled from the extension control panel to include multi-day events and end times)
-a better user interface for menu item assignment (to directly assign to single calendar or calendar groups or calendar list)
-perhaps some color coding for the calendar group presentation (different colors to define what calendar the event belongs to) The calendar starts to look overwhelming with multiple events in each day.
Good extension with room to develop if the developers keep at it.