I am fairly new to this Christian website & just saw this thread.
Yes, I did see the movie & I live in the town where Bart Millard grew up. I went to school with his parents, but didn't really know either one of them personally; his father, Arthur, was a year ahead of me in school, and his mother was a year or two behind me.
Later on, 1968-2011, I was a classroom teacher in the same school district, and Bart was in my class, also Bart and my son were friends when they were in grade school & Bart spent time at our house. So, the movie was special to me.