Does what he should. (Test over one month)

Well packed and receive equal assembled. I took advantage of that arm now for over a month. The assembly is done quickly with some skill. The connection with the worktop's quick, easy and offer a very good grip.
The "Absenkschutz", a ring at the height adjustment at the bar, is a well-intentioned gimmick and can be secured with its two screws with a lot of feeling.
My impression is not really necessary because the holder on the pole with the robust locking lever is a "bomb-proof" connection.
The gas spring hinge can be adjusted, which was not necessary for me in connection with the very slight BenQ GL2450HM 61 cm (24 inch) LED monitor. The joint in the middle was too sluggish to start. So I pulled my equal the whole computer table (with wheels) from the wall. Setting can be here for "Not artisans" unfortunately nothing. After removing the protective cap and the slight loosening of the internal mother was a little smoother. (Here you have a little trial and error. But solve not too far, otherwise shaking the connection.)
The monitor can be tilted in all possible positions, tilt and rotate (also to portrait mode).
Who the arm and thus the joints, like me, very frequently, missing a screw on the joints directly behind the monitor. For an adjustment of these joints you need the long stowed somewhere, supplied tool.
My monitor flips after some time like to forward. The joint I'd like a quick movement "tighten" but nope.
Now for the cables. Who needs to relocate a DVI only one power and for example, this can be very quick and pleasant fix at the bottom of the two arm parts. Cable under the plastic lips press, finished. But he who wishes to transfer a current one DVI, one HDMI, one VGA and one (when possible with) sound cable, gets a real Platzprobelm in the cable brackets. I myself have only three wires to run and had to fumble a lot, since they have "run away" wanted to start with movement of the arm. So let the cables plenty of space at the joints and avoid tension or torsion. Who wants to have it nicely need cable ties.

CONCLUSION: The arm is robust and versatile. The missing, adjustable by hand, adjusting for the joints and the "well-intentioned" cable channel for me the occasion here to forgive only three stars. (The price was not included in my review. While the is not bad, but I want to focus handling, functionality, and processing.)
Small improvements and this product deserves 5 stars.