It comes with an 8 bit SimpleBGC 2.2 controller I think (I haven't adjusted it at all). It works pretty well but even sitting on the ground (motors off) I see it jump a tiny amount at a fixed interval. You can even see it in this flight. It is not perfectly smooth.
I flew a waypoint flight with it yesterday. The waypoint flight does a direction reversal (some significant bank angle) at about 3:00, but the gimbal stays level. It barely cleared the wires at about 4:25 because the altitude was set to 15 instead of the 20 it was set to on the way out. :O I watched carefully with my finger on the FMS.
(password: oops)