Stumbled across a couple of reviews by guys who have test rode/bought a Concours:
All feel that the screen is a bit small. Can't say it worries me although I'm not that long and have just come off a bike with not much in the way of fairing protection. I went through a wee rain burst on Sunday at highway speeds and hardly got touched by rain (might be different in a decent downpour - I got wet on my test ride but had to ride at slow speed at times). My only comment about the screen is that when raised it does increase the wind noise in your helmet - in the fully down position it's a lot quieter.
I guess I'm not used to the luxury of a big tourer...