I got this magic arm for my "home studio" setup, where I need to mount my camera (or phone) for filming something on the table.

The arm is quite sturdy and well-made. You get 3 main joints with ball heads, so there is a lot of freedom for adjustment. It's quite long (22 inches) and has all the standard mounts possible - you get two 1/4" screws + guiding pins on both sides of the arm.

There is a mounting clamp with two 1/4" holes at different angles and one 3/8" hole, so you can actually use it independently with other your camera gear. The clamp is sturdy and holds really well. In addition, there is a standard "phone mount" and action camera mount included, which are of usual quality and work fine, nothing special.

All the screw heads (to fix or release the joints and for fixing the clamp) are large and nicely designed, so you can easily adjust the arm without the need to struggle.

When the arm is mounted on the clamp and on, e.g., a table, the whole setup (+ phone or small camera) is reasonably stable. For sure, you get some wobble if you hit it (especially if fully extended), but it is not bad at all and is actually better than I expected.

Overall, I think this is a great option for your filming gear. Can definitely recommend it.