Top critical review
Not quite as advertised
Reviewed in the United States on February 17, 2019
First, mount plate D had a very heavy coating of something on the threads of the bolt holes that covered the threads, making it very difficult to install the bolts. Fortunately, I had some professional-grade Allen wrenches that enabled me to thread the bolts because the included Allen wrench would have resulted in stripping the bolt head. I didn't try using a solvent to clear whatever the gunk was on the threads but that may have worked.
Second, the product description states each arm supports up to 17.6 pounds. I mounted two monitors, one weighing 11.5 pounds, the other 13.5 pounds. There are three pivot points on the mounting arms and after tightening all three points very firmly, the smaller monitor held position but the larger one, still under the advertised weight limit, dropped no matter how hard I tightened the pivot bolt.
For some reason, I initially gave this product three stars and planned to devise a brace to support the larger monitor then wondered why I would do that. I will return this product and have ordered a different model.