The early results were Not Good.
Screenwriters consistently preferred standard Mac Courier to our custom face. But we soon realized why: the standard Mac Courier is fairly heavy. Screenplays have a lot of white space, which makes thin Couriers look even thinner. As we gradually nudged up the stroke weight, we found the Goldilocks spot which was just right.
Designed for the screen, each character is the precise size as the original Courier. Readers can feel assured that 100 pages is the same length in both fonts. Proper italics, not just slanted glyphs - this doubles the effort.
An exercise in the subtle differences. Painstaking work. He's giving it away.