I used the KG cable for some time and frankly, I am not a fan. When I swapped to Alpa, I bought the Alpa Sync release and after more than a year of shooting with it, over thousands of exposures in at least 10 countries, in conditions from falling snow to tropical rainstorms and in the Arabian deserts at summer temps over 50C, this neat little device has quietly done its job without fuss. It is small, light and has the ability to remove the threaded section that accepts a standard cable release, exposing a long-throw shutter-release button that is smooth and easy to use without vibrating the camera. I sometimes shoot my Alpa STC handheld and simply mount my lens so the release sits horizontally across the top of the lens, triggering it with my left thumb, opposed by my middle finger on the other side of the lens. I even shoot aerials from choppers this way. I am so happy with mine I am considering buying another so I have one on each of my most used lenses and don't have to swap them around. I know some people will squeal that it is expensive but it is to me so much more elegant a solution than any alternatives, small and reliable that I believe it is with the small extra cash. Depending on the brand of back you use, you will have to get the correct cable, but this is well made and fits very neatly without extra cable dangling in the way. Because it simply screws into the shutter release thread on a Copal shutter, it will also work on tech cams other than Alpa.
http://alpa.ch/en/products/lenses/alpa-sync-solutions/alpa-sync-release.htmlCheers,
Siebel