Amazingly simple, works seamlessly and downloads quickly. Love it!
For everyone complaining about the tool not working right now, you need to check Dishita's page at yourvideofile dot org slash v24 underscore temp (Not sure if putting a link in here will get me in trouble with Firefox) but that page on his website contains the current temporary fix for the issue which has been caused by Youtube and Google's constant needless changes to the platform.