Posted for "Matt Hapgood" <matt.hapgood@alumni.duke.edu>:

 HUD would be most attractive in instrument conditions, particularly on
 approach.  That is the only instance in which I would be willing to "pay"
 for the product.  Air traffic is least appealing... if it's that close to me
 in VFR I should see it.  If I already have Mode S then something will be
 barking at me, and if I am in instruments I a) will be DEPENDING on ATC for
 separation and b) wouldn't want to busy up the view with other aircraft on
 final or in the pattern...
 
 M