Honestly, this makes browsing and watching Youtube videos immeasurably better than the vanilla experience. Changing color themes, making videos expand to fit the screen space, adding more controls, and giving the option to disable Youtube Chat are all immensely useful.

Also, the developer seems to be pretty quick with fixes. While the version that is current while I'm writing this (2.0.119.2) was broken one to two days ago thanks to a Youtube update, the dev has a post on his site stating the new version has been submitted and is awaiting approval.