When I reached the two hundred reputation (on puzzling) required to get the association bonus, I received it on chess, stackoverflow, and arquade like I expected. Unlike I expected, I also got it here.
This doesn't seem quite right. The association bonus is to help established users on some sites get a leg up on other stackexchange sites, which makes sense - and I'm glad I got it on the other sites. Getting the bonus here just seems like a fairly pointless bonus for reaching 200 rep.
I like having the extra 100 reputation, but I don't think that I deserve it.
Edit: I just checked, and the rep bonus did not trigger 200 rep on another site.