Well, the grip arrived and it functions as it is supposed to. Interesting is that the on/off switch on the grip applies only to the shutter and function buttons on the grip, but not to the power supply and the remote. When turned off, camera and remote will still function, but accidentally hitting the shutter button will not have any consequences. I like that.
The remote needs to be studied in depth by trial and error. The manual does not easily reveal its secrets. No big deal.
The connection between the grip and the QR plate is flex free, but the connection between grip and camera is not. It's a lot less than what I had with the QR plate directly attached to the camera, but still not acceptable because even a minute amount of flex will eventually weaken the tripod socket on the camera. The problem is a very small gap between the underside of the camera's grip and the corresponding area on the battery grip, even when the connecting bolt is tightened to the max. I solved this by applying silicon to that area on the grip, attaching and tightening the battery grip, removing the excess silicon that oozed out from between the two, and then leaving that assembly untouched for 36 hours to let the silicon cure thoroughly. It's rock solid now and holds even my heaviest collar-less lens plus Metabones adapter without the slightest flex.
