The only trouble I had with it last night was while I was watching the Lucas Oil race at East Bay, one of the heat races started, the video paused for a second, then resumed a few seconds before where I was at when it froze.
Now that I think about it, there was an issue before the broadcast started. But it picked up when they were doing hot lap. I don't know if it was really live then or has buffered and everything was off.