I have read the first three books when I was younger (at the time there were only three books released).
I liked them a lot. True Stephen King writing and you will start listening to the Rolling Stones "Paint it black". I garantee
After I'm done with the Lee Child - Jack Reacher books, I think that I'll restart reading the Dark Tower saga.
I saw the movie "Jack Reacher" in december of last year. Before I went into the movie theater, I was thinking "Who the hell is Jack Reacher?" because he wasn't known here on mainland Europe.
Afterwards I found out that there existed books and on the 3rd of January, I started to read the first book...Two days ago I finished the 15th book, still 2 books and 3 short stories to go.