Its a great product, and does what is promised in the description.
The built quality is not exactly great, but I've shopped around and found this product to be the best price performance in its class. A similar product from a brick and mortar vendor could set you back easily double the price offered here.
Pros: serves its purpose to hold up monitors. A elegant design. Cost effective. More arm flexibility options. Cable management.
Cons: First time setup and adjustment takes a long time, I took 3hrs to setup a Single monitor. Adjustability options are limited, because the screws are really tight.
*Note: not advisable for someone who wants to keep adjusting their monitors on a daily basis.
Overall: Quite a good buy for the price. Ultimately, it is a price performance issue. If you need a bracket just to hold your monitor (which you'd seldom re-adjust or re-position) then this is the product for you.