the only "vote" that makes sense is "No HUD", or if you did have it as standard equipment, take your best guess on how you would most likely use it. I think most everyone is familiar with this "high tech" feature whether you have it or not.
Personally, I find the HUD somewhat hard to read, especially the bargraph style tach and gauges readouts. Those displays are quite crude compared to the highly accurate DIC digital readouts.
Even the analog gauges on the instrument panel are much easier to read. The digital mph readout in the HUD is the one and only redeeming quality. I tend to use the HUD mostly in the speedo only mode. The rest of HUD's readouts only serve to clutter up the display window.
For the track, I've heard it said that the HUD's digital mph display readout is quite useful for knowing entry/exist speeds, which are much easier to pick up at a glance without necessarily diverting your eyes from the course.
I have found the HUD great to deal with and unobtrusive.
I have never had one before, and the only difficulty is in remembering its there and not to have to look down at the regular display.
I keep it up with all features and find the tach and mph particularly valuable when cruising down the street or avoiding police traps.
After picking up my car at the museum last week, I spent a week driving this car to California.
It took me exactly 5 minutes to fall in love with the HUD. I played with all the setting possible and decided I liked the MPH, RPM, and Gasoline gauge on the screen. Now that I am home and may not need to worry about stopping for gas -- I may remove that from the display.
I usually run with the MPH set really dim. Only notice it when I am checking my speed. The only disadvantage is I find myself driving at the speed limit. One good thing about it is my wife can't see the speed on the HUD display. She acts as the engine speed govener. Tends to hold the speed to less then 95 MPH or she wants out.