I really like this stand. I use it for a 21" computer monitor. It works nicely in portrait and landscape mode.
It comes with easy instructions, and screws for mounting the monitor. It came with these screws that were more like pegs, that you could twist with your hand. I was able to assemble it, and mount my monitor in about 5 minutes.
When mounted, turning, pivoting, and adjusting the height of the monitor all work very smoothly. I like that there is a bit of resistance when adjusting the height to a lower level, but the level of resistance is adjustable.
Overall, I really like this stand. It beats any other stand I found for this price point. I was able to buy it on sale for $49.99 CAD.