Abu Ahmad ibn Adi al-Jurjani: I see nothing wrong with him, and once: He is not strong
Abu al-Faraj ibn al-Jawzi: He mentioned him in his topics and mentioned that he said at the time of his death: I have placed seventy Hadiths in Fadl Ali
Abu Hatim al-Razi: Salih denied some of his Hadiths, the trustworthy narrated from him, and once: He is fine
Abu Dawud al-Sijistani: Suhail is higher with us than al-Ala', and once: He is fine
Abu Zar'ah al-Razi: He is not as strong as he can be, and once: He is fine
Abu Isa al-Tirmidhi: Trustworthy according to the people of Hadith
Abu Ya'la al-Khalili: He is disputed because he narrates Hadiths that he is not supported on
Ahmad ibn Hanbal: Trustworthy, I have not heard anyone mention him with anything bad
Ahmad ibn Shu'aib al-Nasa'i: He is fine, and once: Trustworthy
Ahmad ibn Salih al-Jilli: He authenticated him
Ibn Hajar al-Asqalani: Trustworthy, he may have erred
Ibn Abd al-Barr al-Andalusi: Trustworthy
Al-Dhahabi: One of the scholars of Medina, and once: Trustworthy, famous
Muhammad ibn Umar al-Waqidi: Trustworthy, narrated many Hadiths, firm
Authors of Tahrir Taqrib al-Tahdhib: Trustworthy, a large group of trustworthy narrators narrated from him, including Malik ibn Anas, Ismail ibn Ja'far, the two Sufyans, Shubah, al-Darawardi, Ubaidullah al-'Umari, and Muslim relied on him in his Sahih
Yahya ibn Ma'in: He is not that, people have always criticized his Hadith, and once: His Hadith is not evidence, and once: He was asked about al-Ala' about his father, how is their Hadith? He said: He is fine, and once: He was asked about al-Ala' ibn Abdur Rahman and Suhail, but he did not consider them strong, and once: He is not strong, and once: He was asked which of them is more beloved to you, him or Sa'id al-Maqburi, he said Sa'id al-Maqburi