I've been using 'Video DownloadHelper' for about a year now, and just started using this one. While the other app has not disappointed me, my initial impression is considerably more favorable.

Sometimes a video appears to be split into multiple streams/chunks, and my older app can only offer them separate from each other. However, this one appears to detect that, and offer a video to download at the top of the list that is the complete video, comprising of the in-order bytes from all streams at once.