Who authored the book "Madarij al-Salikin"? And is there anything wrong with studying it?

"Madarij al-Salikin" by Ibn al-Qayyim is a commentary on "Manazil al-Sa'irin" by Shaykh al-Islam al-Ansari. Ibn al-Qayyim's methodology in this work involves quoting and explaining al-Ansari's statements, critiquing his errors while offering apologies for them, and taking the stance of a discerning critic towards the words of the Sufis. The book is considered among the most beneficial and beautiful works in its field.