Within the last year, I read Lee Strobel's book, which unsurprisingly, contains a phenomenal amount more detail about his research into 'the historical Christ' than the film could ever hope to achieve.
However, in so many ways, I gained more from the film version as much of it majored on Lee's struggle towards truth.
So many times I found his experiences and investigations mirrored my own. Like him, I did not desire to take on the inconvenience of becoming a Christian.
(Even so, I must hope that I was never the total prat that he clearly was prior to finding The Saviour.)
Never could Jesus's claim that 'those who seek, will find' be better exemplified.
I can wholeheartedly recommend both book and film.