What is your opinion of the book Musnad al-Bazzar?

Al-Bazzar's Musnad is one of the well-known Musnad collections, organized by Companion. It does not stipulate authenticity as a condition. Al-Haythami frequently cited its hadiths in Majma‘ al-Zawa’id that are not found in the Six Books. It is a good book, but its chains of transmission must be examined.