If you're looking at this then you probably have a heavy monitor and realized you don't have many choices. You could always get an Ergotron if you're rich but this will do just fine and I'm actually pretty impressed for the price. I bought the dual arm version and I wanted one arm to hold up my HP ZR30W which weighs 21 pounds. The other arm holds a lightweight monitor so whatever nobody cares.
I use this product to support a 33lb iMac and 27" Cinema Display, and it holds them both in place with ease. The arms themselves are designed well, built well, and finished well. The cable management is not entirely internal, but very easy to use. Their customer support was responsive and clearly focused on making sure I was delighted with the product. I am extremely happy with this purchase. I couldn't be more pleased with the product and the end result.
Been looking for a two screen stand for my Alienware 34 Curved screens and this did the job. I would say easy to put together but directions do need improving at bit. I would say sturdy and well built. The only thing I don't like is the tilt friction is not that great. You have to tighten the screw snug to hold in place and if you want to change the angle you have to loosen the screw to do it. But mine will be static so no need to readjust. I do like that it frees up desk space now that the stands are gone, so I have more work room. I gave Sturdiness 4 Stars because of the tilt issue, but 5 Stars overall.