Having previously tried the Phottix Grip, but gave me contact problems and in addition not really firmly and accurately seated, I ordered the Vertax. What can I say, as different as day and night. The Vertax is processed more massive, more stable and better. The camera sits 100% accurately fitting, because nothing wobbles. All keys will operate as perfectly. Now for the drawback: Unfortunately, the "control key" a very sensitive pressure point. One already requires some practice to navigate by means of the button or move the focus point without triggering a "click". Too bad, otherwise perfect, but all in all very recommendable!