I just bought a 2014 Prius Four with the solar roof package. Included in the solar roof package is the Heads Up Display (HUD) feature, which I didn't really care about, but it was there anyway, and I didn't give it much thought. However, what I have found is that it creates a large amount of glare on the windshield directly in my line of sight. The windshield defroster vent creates glare too, but it is lower and not right in the line of sight. I think the glare is primarily from the large frame-like border around the hole in the upper part of the dash that projects the HUD. I wish that Toyota could have somehow just made a simple hole in the upper dash without that big border around it, thus minimizing the glare. Of course, there's nothing I can do about it. But I just wanted to point this out to any of you thinking of getting an option package that includes the HUD.