I have 3 Premier which I got over the last 2 years or so for $30 average , So I just went to Bestbuy and ordered a Chromecast GoogleTV (Google comes up with the WORST names) , however the guys on reddit claim it is just a dongle (like Roku) with a remote (that may control the volume).
So all I have to say to Roku, after having them for 10 years is "Way to go Guys".
At any rate I did try out Casting (from PC and phone) and that seem to work fine . However I am casting to the Roku, so that might be a problem if this fight gets ugly.
Actually I was pretty impressed with how easy it was to Cast , then I found out my 4 year old granddaughter does it all the time, while my daughter was Zooming to her classes last spring. But she is way smart.