The PB360 Manual is on the lean side.
You'll get a better feel for how it works from Kacir's tour-de-force walkthough:
https://www.mobileread.com/forums/showthread.php?t=61908
That's what sold me.
Also, consider these two mods:
https://www.mobileread.com/forums/showthread.php?t=65865
https://www.mobileread.com/forums/showthread.php?t=67149