I believe the Boeing 787 Dreamliner will be produced with each pilot having their own HUD. I fly a NG 737 with the HUD and like it most of the time. But there are two drawbacks with the arrangement. First is its potential to mask traffic. This is a problem every time I fly in congested terminal airspace. Often I move the HUD up and out of the way under those conditions. The second is the transition from flying to landing and then turning off the runway. By design the HUD clears some information, but what remains is a distraction once you clear the runway under many visibility conditions. You have to drop your eyes down to locate the shut off switch or ask your flying partner to turn it off who then has to drop their outside scan to locate the switch. Boeing should have put a HUD turn off/on switch on the yoke or the tiller.