I had the stabilizer for my 8x10 Canham camera; it worked as far as stabilizing the front and rear standards together, which I do believe can be an issue as far as stability and movement for many large format cameras--and the larger the camera the more an issue it becomes. The problems with the stabilizer were that it was time consuming to set up; one more step in the taking of a photograph; and also the hardware that attaches to the standards, the 'mounts' were usually sticking out and susceptible to being knocked loose or knocked off, and being lost.
I have actually had good success with a very simple trick I use now for stabilizing my 11x14; I have found some very thick and large rubber bands, and I can easily attach the band around the front and rear tightening knobs in a second--very easy, but definitely more stable overall when needed-particularly for longer focal lengths.