The nature of the book leaves my review without a star rating. For those who don't know, this book is designed to be used as a sort of manual or guide while on a spiritual retreat. It's not just a spiritual book like something by St. John of the Cross that one would read daily and meditate with. Ideally, one has a director and is on a retreat, not doing it on one's own while living a life that contains work and other secular tasks. I did do it that way, though, and I still benefited from it—but I would not recommend that to many people—if anyone—nor would I recommend it to all Christians even if able to do it on a retreat.
The book guides one through on rigorous path to unite the mind, the emotions, and the will in order to detach from sins, from the worldly and temporal, and from oneself, so as to produce a disciplined servant of God whose desires and whose whole life are set on the Eternal. The methods St. Ignatius uses employ the senses and the imagination in various practical (though not easy) exercises, divided up into different 'weeks' (not necessarily seven days), with a different spiritual goal in mind. I would recommend it to anyone new to the faith, or new to taking their faith sincerely, if they are able to find such a retreat; or to someone who is more advanced in the spiritual life and desires such a means of disciplining themselves, getting out of their routine and comfort zone, and growing by trying the body, mind, and spirit. However, if such a person could not find a retreat and director, it would only be helpful if he already has a lifestyle and personal discipline conducive to such a retreat on some level. Even so, they would not benefit as much as they might want; nor did I benefit, I think, as much as I could have in a better setting and with a guide. If one were to do it oneself, I give the following cautions: Read through the entire book first (this is necessary to undertake the exercises), and maintain caution. St. Ignatius is rightly honoured for his catechesis on discernment and for his zeal for God. However, I do not agree with everything in this book, and doing it alone could be dangerous for someone not already practised in spiritual discernment. And while St. Ignatius' teachings on discernment and prayer are great and many of us have learned them without knowing it was in part through him, one can read elsewhere about his rules for discernment (for instance, Fr. Gallagher's 'Discernment of Spirits'). Finally, do not read the Louis Puhl translation that I read.
Also, there is a section of mysteries of the life of Jesus, which I did not read all of—but neither would many going through these exercises, and I think what I've written still holds.