I started reading this at roughly the same time as The Sparrow. What I learned here shed an interesting light on that book, which didn't fare well by comparison. I learned more of Jesuits and Ignatian spirituality here than I did at my Jesuit college - but then I had other focuses at the time.
This book is very accessible and covers both history and practices in a clear stepwise fashion. The narrative illustrates these steps neatly as well. Even though I was often interrupted, I found it easy to get back into the flow when I could sit down to read this.
I understand the audio version of this book is narrated by the author - I plan to seek that out for a future re-read.