Hiyall, as newbie I'm asking: is BP a good choice?

Hi,
I want to install a forum into my WP blog.
My priority would be to have a "easy to understand" and "not too complicated to implement" but "truly working" software.
Does anyone have experience with more than one forums?
Can you give me reasons for what to choose?
Give hints for what is important to consider?
Thank you!
Greetings from germany - Michael