The following paragraph from the 47th Rose summarizes why you should/shouldn't read this book:
"[I]f you want to lead a fashionable life and belong to the world- by this I mean if you do not mind falling into mortal sin from time to time and then going to Confession, and if you wish avoid conspicuous sins which the world considers vile and yet at the same time commit 'respectable sins'- then, of course, there is no need for you to say so many prayers and Rosaries. You only need to do very little to be 'respectable': a tiny prayer at night and morning, an occasional Rosary which may be given to you for your penance, a few decades of Hail Marys said on your Rosary (but haphazardly and without concentration) when it suits your fancy to say them- this is quite enough. If you did less, you might be branded as a freethinker or a profligate; if you did more, you would be eccentric and a fanatic. But if you want to lead a true Christian life and genuinely want to save your soul and walk in the saints' footsteps and never, never, fall into mortal sin- if you wish to break Satan's traps and divert his flaming darts, you must always pray as Our Lord taught and commanded you to do."
This book is very challenging.
It challenges you to engage in this prayer. The Rosary is an ancient practice that sometimes seems is only seen through people wearing the Rosary as a necklace, giving no notice to its spiritual import, or through groups before Mass who blast through the 5 decades like nobodies business.
In this book, St. Montfort supplies us with a spiritual history of the practice, and a breakdown of the prayers and mysteries associated with the sacramental.
I especially like the shorter Montfort Method (Method #2) which adds words to the Hail Mary in an attempt to aid with the meditation on the individual mysteries.
All in all, a great read for anyone interested in this great practice. And a true challenge to those who wish to plum these depths further.