Another advantage of having the ability to do a single engine CAT III approach is it usually also allows you to have lower takeoff alternate minimums. Therefore the airline can save money on fuel tankering by not having to have a takeoff alternate.

This may not sound worth the price of the system, but like others have said here on the west coast we get fog quite often. I'm looking out the window right now and can't see very far. I have done many CAT III approaches in my career, flying soley on the west coast. I have even had to hold twice when the weather went below 600 RVR in Seattle.

The other thing about the HUD is it is a great thing to use in every day flying. It is a great tool for precise aircraft control and allows your eyes to be out of the cockpit much more.