eforum25 is by FAR the most versatile PHP message forum script set I've ever come across. Configuration is very easy and straightforward.
HOWEVER, integrating eforum25 into a site - especially one with a user-login system, it VERY tedious and complicated.
Because eforum25 uses flat file data storage, it is VERY hard to edit if you are used to SQL storage - one of the features that makes it near impossible to integrate fully.
Also, it unexpectedly bans IP addresses - no warning - Scripting glitch?