Finally found one of the techs at the dealer that knows the HUD system.
Yes, the X3 HUD is a cheaper version than one used on the M5.
There are several things that show up only temporarily in the windshield (fasten seat belt, door open, etc).
The only 24/7 type display is the speed and (if you have nav) your nav directions if you enter a destination.
Really wish it had the M5 system.
PS: wife's vehicle and only has about 350 miles on it in about 6 weeks.