This monitor stand/arms has been great so far, holding up my 3440×1440 ultrawide, with another 27" 16:9 monitor coming in the near future.
Couple of things to keep in mind when buying this product. The joints for the arms are slotted together and held tight by a small screw which can be tightened with the supplied allen key. Do NOT tighten these too much as it will cause the ‘metal’ to split…
Also keep in mind that these two arms are the same height, and while the entire arm unit can be moved at once, the arms can not be moved up and down separately. For this reason I'd recommend trying to pick similar monitors to mount next to eachother, as depending no the size of monitor, and position of vesa mount, it could look odd if you do not do your research beforehand.