At this price very good (especially stable) product.

First is to say to this mount, that they and the joints are very heavy very heavy. The changes essentially when monitors are attached to it, because the leverage of VESA mount and the size of the monitors make up more than one would think.
The included desk stand, I would probably not use in this weight (support + monitors) generally, A slip of the same (which may due to misalignment of the monitors and a consequent shift of gravity to pass before) a significant damage can occur. I drilled a 1cm hole in the table and therefore used the second fixing solution. This is extremely stable and now you can see the arms and any swing to have to observe something without.
Assembled I all alone, but I would recommend that anyone who does not have a substantial physical strength. If only for the initial alignment of all joints requires either strength training or 2 people. After mounting and alignment can be poor with little effort and adjust well alone.
So the summary:

Pro:
- Very flexible monitor clip, arms are individually height adjustable / rotate / tilt, the monitors can therefore independently positioned
- The holder solution using a hole in the table top is very stable and superior in my opinion, all table clamps since slipping can not occur and the focus of the construct does not matter
- Overall very stable support that is very well made, at least in my case.
- Only half the price of some comparable models (Ergotron LX and co)

Contraindications:
- The Auna / Duronic solutions appear to be nearly identical and costs at the moment 20% (27) less, but I'm happy with this model, because the other is not specified whether an attachment to a tabletop hole is possible.
- Building designed as a result of the considerable effort expended in the initial alignment of the arms as a bit of a hassle (tip: do not despair, the first monitors attach and then using these arms align)

And if anyone doubts: yes, I have set before the gas springs according to the instructions on "weak" and all kinds of screws easily solved, the alignment of the arms is still very strong consuming.

Overall, I am absolutely satisfied with the product, as I go out of it in this stability and processing that the good part yet with me a couple of decades.