Depending on the use of optimal

The portion was perfect for my purposes and the assembly was actually not a problem, not least because of the integrated spirit level.
Only the 2 small screws, with which the monitor can be additionally fixed after mounting to the wall part, can be reached only with great difficulty. It takes a very long, thin Phillips screwdriver, and when used directly beneath a shelf or furniture superstructure, one has to get little chance it. That could become a problem eventually with larger screen sizes and weights as greatly changed the position of the device, with lateral Brührungen or impact, of course, more or less. On my 24 "monitor I simply omitted.
Conclusion: Anyone who wants to bring his monitor extremely close to the wall, just have to make compromises and, depending on the device, for example, also angled connector, or adapter, use for electricity and HDMI port here. In my case I had additionally a thicker washer between the device and attach bracket to gain the necessary minimum distance from the wall - Despite angle plug.
Still, I give it 4 out of 5 stars, but would not recommend for the reasons mentioned everyone to check their own facts before buying and to consider whether the effort is worthwhile, especially for larger, heavier equipment and planned use of a hard to reach place.