Although I managed for a time with the delayed shutter release option when using my 400D on a tripod, the 10 second delay between pressing the shutter and the taking of the picture frequently meant the scene had changed. So I went for the obvious, a cable release or remoter switch. As I do a lot of close-up photography working behind the camera this seemed the better option over a wireless remote which operates from the front
With a very positive action it is easier to control the dual operation than using the camera's own button. In fact I use whenever there is the likelihood of camera shake, and not just when using the camera with a tripod; hand held telephoto shots or close-up shots, or when selecting a slow shutter speed it is invaluable as one can press the shutter realise with no fear of moving the camera.