Well, since I haven't received mine yet, I can't say for certain how bad it is. But based on a few youtube videos and user reviews here on the forums, it doesn't seem that bad.
http://www.youtube.com/watch?v=EOoLX0nzf1U (this one is in german, but you get to see the screen outdoors)
http://www.youtube.com/watch?v=VHu0FuoQSAU (at about 5 minutes he talks about glare)
I think it really depends if you have the light directly against it or not. I shouldn't be too hard to find a comfy position without glare.