Historically I was with the others regarding views on anything other than stainless steel. However, I recently felt the need to try something different. Which led me to get one of these (opportunity presented itself and couldn't resist)
Overall I am very impressed with the quality and look. For me, it is not something I can wear too often as it is quite dressy and my work environment doesn't really require that. As a result I am not worried about durability of the finish. Also, my wife has a gold plated Movado that she has beat on pretty hard over the last 8 years and it still looks great. So if the finish on my Hublot is even half as good I am not worried at all. For your brother it sounds like it won't get thrashed too much in his hands given your description of his job so I wouldn't let the plating issue sway your decision too heavily.
Best of luck in your search.