I already posted this in the [ Templates ] DAW, Overbridge & settings (Mac) thread … but maybe logic users will look here:
So finally I got Overbridge working in Logic X 10.2.4. I had to mess around a bit with Logic internal audio buffer and working buffer settings. But this gives me a nearly on the grid sync with less latency:
Apple Macbook Pro I5 2,3ghz
4GB RAM
El Capitano
Logic setting:
44.1 or 48 khz
buffer: 256
working buffer: small
audio treads: 4
Overbridge:
buffer: 256
margin: 150
clock mode: song
A4 + AR runing stereo channels into logic … WORKS! 
Not recorded yet nor tried to add some more plugins (delays, eq, etc …) … but you can always add later.
Will do some more tests over the next days. For me it works now.
BTW … somehow the audio from Overbridge sounds better in Logic than in Ableton 
Cheers and Merry Christmas everyone!