What is your opinion on the book "The Issue of Takfir" by Sheikh Saeed Al-Qahtani, and what books are recommended to read on this topic?

Shaykh Dr. Sa'id bin Ali Al-Qahtani is among the people of knowledge and has many beneficial writings, including the book "The Issue of Takfir Between Ahlus-Sunnah and the Deviant Sects in Light of the Qur'an and Sunnah," which Shaykh Salih bin Fawzan Al-Fawzan described as a valuable and sufficient treatise for the need in a time when truth is mixed with falsehood. Among the other books that can be referred to in this regard are: "Controls of Takfir According to Ahlus-Sunnah wal-Jama'ah" by Dr. Abdullah Al-Qarni, "Ibn Taymiyyah's Methodology on the Issue of Takfir" by Dr. Abd al-Majid Al-Masha'bi, and "Credal Nullifiers of Faith and the Controls of Takfir According to the Salaf" by Dr. Muhammad Al-Wuhaibi.