What is Imam Ibn al-Qayyim's methodology in the book "Madarij al-Salikin," what are the observations regarding it, and what is recommended for its reader?

Ibn al-Qayyim's Madarij al-Salikin (The Stages of the Seekers) is a commentary on Al-Harawi's book Manazil al-Sa'irin (Stations of the Wayfarers). This commentary served as an opportunity for Ibn al-Qayyim to express his views, as he did not adhere strictly to Al-Harawi's arrangement nor did he comment on all sections of the book. Ibn al-Qayyim defends Al-Harawi but differs with him on some points, and frequently mentions his shaykh, Ibn Taymiyyah. The book is distinguished by its focus on the purification of souls and the works of the hearts. Observations about the book include occasional repetition, disorganization in its divisions, and inaccuracies in some statistics. Nevertheless, these observations do not diminish the value of the book, and many scholars, such as Shaykh Al-Uthaymeen and Shaykh Al-Khudayr, have praised it, emphasizing its benefit and importance despite its author not being infallible.