I have used this product for several years, primarily as a tool to assist in building projects that have many repeating sections that each require a little variation. I build the framework, then go back piece by piece and fill in the details. I.e., when building classes for the semester, each class needs a syllabus, a schedule, the online LMS update, student keys/tokens generated, etc, etc. I do one "generic" set of cards that has all the material that does not change class to class, copy that generic deck into a deck for each course, then go through the deck for each course adding in or changing the details that are unique to that course.
On a personal level, my wife and I use it to organize our Christmas list each year. Each member of the family gets a card, gift ideas are added to the cards, and the items are checked off as they are ordered and/or received. We can access the list from any of our devices and the updates move out to all the devices in a reasonable amount of time
Finally, Adriano is very approachable and he has answered several questions over the years that I have used Gingko Writer.