I've had a chance to use my NAV system about a half dozen times in the past 4k miles, and I am very impressed with the way it uses the HUD to display directions. I've set my E60 to be 'slient' and not say the directions; instead it shows them on the HUD clearly and effectively.
Seems like BMW made this system especially for husbands to looks good to their mates

because my wife thinks I'm suddenly so much better at finding places....
Anyhow, the HUD is worth every penny as I use it every day and really love it. Brightness is automatically controlled and isn't anoying night or day. It keeps the drivers eyes outside, on the road, rather than inside.
I've had nav systems before, but they were always 'yacking' at me and too obtrusive or forcing me to look at a small screen for directions. So I give BMW a major

for their implementation with the HUD. -steve-