This does exactly what it says and it does it fast and without any big problems. Definitely recommend this to anyone who is tired of Youtube setting your "Auto" quality to whatever speed your internet happens to be going at in that moment. My only problem, and it is a small one, is that with the recent update it has made it so when you attempt to buffer through videos with the arrow keys, it brings up the settings menu after each buffer, disallowing seamless buffering with the arrow keys. Not a huge problem by any stretch, but I would love to see it fixed.