For years I've always wished I could turn the TV volume down and listen to the call on the radio, but a 7 second delay on FSN would always mean I got the call on WLW too early.
This year it's a lot closer. I'm watching the game right now with the TV on mute and the radio on, and the plays are being called within about 1 second of the TV feed.
Pretty neat if you'd rather hear Marty and Kent Mercker over Grande and Brantley.
Edit: Forgot to mention I'm using Dish Network to watch the game, not sure if it matters.