Hi flitelab
Didn't have to much time for extensive testing. Took the Alware 3-Axis Pro V2 off the 500X and bolted the Crane on and connected it to the GU-INS gimbal ports (pan axis straight to the Rx) ...straight and perfect fit. I did a few FPV-flights (sorry...no recording) but my impression was that the performance is a lot better due to its very rigid construction...no rattling around. Since I do not plan to hook it to my Cinestar 8 or my S800, I won't be able to tell how it performes with any other FC than the GU-INS.
PS: On the Crane /500X setup I am using a FlyCamOne HD, so I also can't tell you how the Crane performes with a heavier camera.
...hope this helped
Chris