I have a Roku HD and a Roku 3 hooked up to HDTVs (one of which also has my desktop PC hooked to it). Given that I don’t particularly want to watch shows on a small screen (and can already use certain apps to do so if I wished), what further benefit would the Chrome device give me?
THAT would serve me just nicely.
The end product of a Chromecast is you get to watch something you have selected from YouTube or Netflix on an iPad or iPhone or most other similar gadgets and watch it on your HDTV.
You can already do that with your Rokus. So the only advantage with a Chromecast, assuming you have the supporting gadget, is a much easier search since you have a keyboard and, in the case of the iPad/iPad, voice input. So finding things is quicker. That's really it.