I am fairly convinced. The friction of the arm is good, once tight there is no play. For cons, I'm less excited about the attachment to end by two screws. I screwed on some of my shoulder kit, but all does not stop turning on that axis and loosen. I myself often have to try several times to hold the (nearly) correctly ... Apart from that, the arm seems to support the weight of the accessory (in my case approximately 500g) and comes with several useful mounting brackets (one shoe and clamp).
