I just received my Promote Control recently. If you use a DSLR like mine (Canon 5D Mark II) which will only bracket three exposures, the Promote Control allows you to capture a much higher dynamic range. Instead of just three brackets you may capture 5, 7, 9 or more exposures! My experience so far is that it is easy to use and allows for capturing the series of exposures in live-view mode, which is fantastic. Read more at Promote Systems.