I find it invaluable.
Yesterday for instance, I had a mask leak rate of 0.14l/s and it is usually around 0.06. It has been going up for the last few nights actually.
Looking at the detailed data, I could see there were 2 specific times where I had a VERY high leak rate which skewed the nights average.
So it's not something I need to worry about.
Without the software, I would not have known and could have been chasing my tail worrying about phantom leaks and wondering if I need to get a new mask etc.