A very clever, easy to use add-on. Great step-by-step instructions. You can download videos for free if you don't need high quality, just to learn how it works. AND, if someone who has paid for the HD download capability has downloaded the same video you're watching in the last 24 hours, you can download the HD video too. Once you've learned how easy it is, you can donate as little as $10.00 and get the HD download all the time. Now I use this to have vendors create videos for me, and I can download them straight from YouTube in HD all the time. A great (and inexpensive) investment! I use this both professionally and personally.