I was looking for a swivel mount boom arm for my Shure SM7B, and had seen this one in a couple of Youtube videos. After ordering it, I was not disappointed.
The build quality is excellent. It is spring loaded, which feels a bit weird when there is no weight (i.e. microphone) attached to it.
Rode provides two ways of attaching the arm to your desk. One with a desk clamp and one with an in-desk piece that requires you drill a hole in your desk. The clamp only fits an even, standard desk. My desk is a bit more exotic in design, so I had no choice but to drill a hole. Instructions were clear, so this was no problem at all.
As soon as there is weight on the arm, it feels very smooth and you can position your mic in any way you like.
It even comes with handy cable straps to keep the XLR cable nicely in place.
Of course there are out there that offer more features, or an even more robust build quality, but in this price range, you can't beat the Rode PSA-1. Recommended!