I read Walking With Sam and much enjoyed it. Mr. McCarthy is an excellent writer.
He is candid about aspects of his life and his Camino that are less than flattering. An example are his accounts of a couple of interactions with hospitaleros who did not always provide the answers he wanted to hear. He doesn't shy away from the fact that on a bad day, he could be 'that guy.' Mr. McCarthy doesn't let himself off the hook and there's a connection between his father's personality disorder, his own behaviors, and their impact on his relationship with his son.
Sam makes for an interesting character and it's not until towards the end of the book that you get a better picture of his background (entitled yet certainly not idyllic) and, particularly, his personal challenges. His romantic troubles, academic challenges, love of sleeping in, digital media use and abuse, and teenage willfulness are all familiar (at least to me -- Sam's twin lives down the hall from me whenever he's "taking a semester off from college"). The extent to which Sam can get under his father's skin is pretty amusing. The dialogue between Sam and his father is priceless -- I look forward to listening to the audio version.
I was intrigued by the few short accounts he gives of his first Camino and how he was inspired to walk by reading Jack Hitt's Off the Road. His experience as a travel writer shows. I would love to read more about his thoughts and experiences on the Way before it reached its current popularity.