It's weird listening to a game on radio. And I used to listen to tons of games on radio each year. But now, even the weekday "business day specials" are usually televised. It's a rarity when radio is the only option for me.
Brantley has improved a little as a PBP guy, but he's still awful for the most part. The game is much easier to follow when Marty is on the call. Brantley doesn't "paint the picture" of what is happening ... unless you count abstract art. On the other hand, Marty makes you feel like you're watching the game.