If you are trying to download any video through any website, try this. Either you can place your required link in the app, or directly open through this app. But if you want to downlaod a video from youtube its a very good medium. You can directly access youtube from here and download almost any video, in different formats like mp4, wav, etc.
Quality can also be increased or decreased as per your requirement. The app updates accordingly and is thus improving all the way fron start. Now, I think they should also include other video channels like yahoo and others.
As such a good app and a very good youtube video downloader.