Attached Link: Stephen Johnson Photography

I use it when I use my 70-300 mm lens. Also sometimes on windy days or when I need to make sure I have no movement. I also carry a monopod with me most of the time. I is not quite as good but it is better than hand held. I use it in public places where tripods are too big to set up. 

I want to get a 70-300 VR Nikon Lens that takes care of shaky hands. Once I do that, I will use the tripod much less.