Anyone planning to use a doula?

Linea • 28 years old. Just found out I am pregnant with #2!
I will admit, I don't know much about them, but would love some information from any of you who are planning to use a doula or have used one for a previous pregnancy! And any men out there who might be reading this - what was your experience like with your significant other's labor if a doula was involved? Thanks! :)