I really like this song and I think it sounded great when Brian did it on the Smile tour. It's one of those songs you can tell he really gets into.
I've heard the Beach Boys version on a bootleg called Landylocked. I think that the Gettin' In Over My Head version is actually better.
I actually agree, I really like Brian's vocals in the bridge. I don't know, there's something touching to me about him sharing vocals on a song with Carl after he had passed away.