As an experiment, will try BBC this weekend. Quality was slightly better than SD - not HD quality.
I am able to legally get NBC's streaming - from 3 diff. Comcast accounts in my name. (2 ours, one MIL's in a care home.) Will try that - although will mostly watch the regular NBC programming. Will record it on DVR and start watching 1-2 hours later so can FF thru ads and the non-sense bio's of athletes that they run often - at least in past years. We had Canadian sat. service years ago before our services had HD (sat. and cable was late) and was able to watch Canadian broadcasts of Olympics. Excellent coverage. Hours of live coverage.
Chromecast didn't work w. the CBC stream - had to hard wire.