I bought a Shutterboss a couple of weeks ago and have been using it for some product shots. It works quite well for when the camera and tripod is further away than my wired remote can reach and I have to rearrange things as I am shooting. However, I just spent a few days in Monterey and was taking pictures of the waves crashing on the rocks. I used to shoot in high speed mode to get just the right splash, but apparently the Shutterboss doesn’t work this way on the 5D Mk III. It only seems to do its own multiexposure mode, taking an exposure once per second - way to slow for wave action. Unless I am doing something wrong, this takes it from a five star product to a two or three star for me.