Excellent arm
I've had this arm for 3 months now and there's still nothing to report.
I bought this arm for a 49" screen with a curvature of 1800R and a weight of 11.6Kg without its stand.
The arm supports the screen perfectly, I can move it (gently) without any problem and the screen doesn't 'fall' despite its weight.
The cable routing is fairly narrow if you want to run more than 3 cables through it, but that's just a detail.