Useful, but not always. I wish more formats (sizes) were available for download. One problem is the way the list of videos available for download will not correspond to what is actually on the page being viewed. The names of the videos seem correct, but when I download one of the videos, I end up downloading an video from a prior viewed page ! What I have to do is close the window and open a fresh tab to download the video desired. I do appreciate the simplicity of the interface and the fact that it does work a lot of the time.