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I suspect the problem other folks have encountered is that the level of strength required to get the strength correct is beyond normal hands with an allen key. I used a Milwaukee M18 impact driver with torx bits to do the tightening and loosening (strength 2 of 4). The adjustments have an exceptional range of precision. The clamp portion is very large, but enough room to fit through a Magnus Pro XL desk (lighting strip) area without impeding the compartment area.
The cable management is fine. Seems some people didn't know how to set that up either. A little finicky but was able to string two HDMI cables and a power cable with room to spare.
When I ordered them I took a big chance and figured I had a 50% chance of returning them. I also needed 300x200 VESA mounts but these arms only come with 100x100. VIVO sells adapters, but I was able to combine parts from my prior wall mounts to get it to work.