Just checked CEC using the Chromecast Ultra and the Vizio M43-C1 TV (2015 model.) The TV remote buttons Play, Pause and Exit (Stop) work. The FF, Rew and Skip Back buttons do nothing. I was hoping they would do something. There is no Skip Forward button. Select (Enter), Forward and Back buttons do not work like they do in a browser either. No other buttons control the Chromecast. In addition to most of the usual smart TV controls, this remote also has a full keyboard. Lots of lost opportunity there. Even though Stop works, there is no way to restart without using the Android app. I would be happy with Play, Pause, Skip Back and Skip Forward. Ran across a review that said the Chromecast interface is a bit dated. I'd have to agree with that. Even though the underlying technology is very good, it's otherwise limited by lack of usable playback controls.