Abu 'Abdullah Al-Marzubani: Trustworthy, truthful
Ibn Hajar Al-'Asqalani: Famous, has authored books
Al-Khatib Al-Baghdadi: Trustworthy
Al-Daraqutni: Not very strong, an elder historian, acceptable
Al-Dhahabi: The Imam, the Hadith memorizer
Muslim bin Al-Qasim Al-Andalusi: He had some Shiite tendencies