Upon receiving the Steady Shot arm I proceeded to install the ball my ball head and then adjusted the height taking into account the height of my camera. I then proceeded to attach it to my g3 harness and last attached my camera with Canon RF200-800mm lens. It worked as well as expected, as the main function is to "Steady ones camera for good steady shot". One can walk around with it as long as one steadys the arm with one hand to keep it from moving from side to side and front to back. It performs the job that it is meant for pretty well. It does steady the camera extremely well for perfect pictures. If you go to Cotton Carrier.com and watch the video you'll see how the person uses the Steady Shot Arm. A well made product!

This device is not something one would want to attach and walk around with all day. However, the point is for stability when a tripod is not what you want to use and for that, this is a great invention.

I bought this mount with the harness about a month ago. The harness is fine and I have used it a few times.
However, the steady mount is, as yet, untested. First there is no list of items that are supposed to be included, so I wasted a couple of hours trying to figure out how to attach my camera. Then I asked for help and was told that a 'universal' plate was missing. It was sent and arrived after 5 days I believe.
Still no helpful information. It took me an hour of so to realize that I either had to cannibalize my tripod or spend more money buying a quick release clamp to attach to the universal clamp which attaches to the mount.
A month later and I now have it ready to go.
My first outing suggests it will do the job - stabilizing my 150-600mm lens when it is not feasible to use and move around with a tripod. It is kind of awkward to find somewhere to stow the mount when tackling difficult terrain with the camera stashed in the harness.

The harness is great. But the SteadyShot arm is tricky. I’m trying to figure out how to attach my ball head to the SteadyShot plate. My ball head attaches via a 3/8 inch screw but there are no 3/8 inch screw holes in the SteadyShot plate. The SteadyShot arm does not come with instructions.

Have only had my SteadyShot for 3 days 8/31/21-9/3/21. The SS is solid well engineered equipment. I prefer to use Manfrotto monopod bullhead. There are 2 issues I've noticed when using big glass, Sony 70-400mm G2 with lens collar, is SS has to be taken apart and adjusted at both release points to get proper height because combination of ball head and lens collar raises camera view finder very high. Also wish there was way to lock down base of ball head to SS mount to keep it from turning like tge set screws on the Manfrotto monopod or tripod. The other issue is combined weight of big glass and ball head pulls harness forward putting extra pressure on shoulders and harness has no real adjustment to tighten the shoulder straps. I tried using the lens holding strap on the harness to keep the vertical bracket tight to harness. It helps but not really well. All that said it's still a good idea I hope will prove to be handy when I take it out to field.