Over the course of 10 years and a new format every month that I had to import into my automated systems, I built the back end of something like this. 1/10 the ability of this tool of course, but seeing this as an open source tool would have cut down 90% of my work in those days.

I now know how my father felt when he saw a spreadsheet on a CP/M computer for the first time. He was an accountant that used a yellow pad and pencils and an adding machine. My father was the spreadsheet. And then I showed him something that made him think about 20 years of his life lost to a useless task.