Other than the frame mounted vs fork mounted fairing, there isn't much difference.
That and the Road Glide's fairing supposedly went through extensive wind tunnel testing to eliminate the turbulent airflow that causes buffeting. I hear even with the mail slot, the Street Glides still throw a lot of dirty air.
To Azdave, what there is to get is that you don't have a heavy fairing full of electronics mounted to the handlebars. Remember how you noted once, not too long ago, that of the three bikes you've had recently, the Vision was the best handling. Well, standard tire sizes and fairing free forks go a long way to explaining why.
The Road Glide is the Vision of the Harley family. It gets compared to the robot while the Vision gets compared to the clown. In both cases, they are the best of the breed. You get all the gizmos ya like with none of the fork weight or wind induced instability of fork mounted setups.
I've always preferred the Road King as the fairings of Road Glides past have always been criticized for their poor performance. If they got it right this time, I think it'd be awesome. I don't like nor want a bike with lowers. And I don't want a bike that I have to look thru a windshield. If this thing keeps the windblast off your chest without turning the rider into a Bobblehead at 80 mph, I think they got a winner on their hands.
But speaking of hands, those idiotic tiller handlebars gotta go.