I have a galaxy note 4 with the defender series otterbox. a few zip ties through the belt clip around the center of my bars on my interstate and its solid as anything. it is also the only thing I could find that was large enough to hold my phone. no way of shooting video with it but for gps I love the location
I have the Note 4 and the defender otterbox too. I have the normal size spring loaded X-grip holder.
What I had to do to make the phone fit was, the two arms you squeeze to open the holder, I re-bent them. I bent those 2 arms strait than bent them up again to make the grippers, slightly wider.
Now the X-grip works just fine.