Now, I know that the personal visual spatial 'trick' for memorizing unrelated details in the Superior Memory report below would not work for me because remembering ways and routes are my particular weakness. I'm not sure how many of the Memory Champions were men, but in this other study: http://news.bbc.co.uk/1/hi/sci/tech/685321.stm men tended to recall locations by geometry, while women more often memorized landmarks. So women may know how to get to a particular place by "2 Rights, a Left, stop sign and find the green house", while men may realize it's "over there somewhere."
Superior memory seems like it would be great, but there are definite downsides to the gift. Remarkable mneumonists may have a greater sensitivity to distraction, they may have overly personal memories (have difficulty memorizing material in an impartial way), and they may get into trouble when they can't offload or forget information when they're trying to switch tasks.
From Luria's "The Mind of a Mneumonist": "...trying to understand a passage...became a torturous procedure for S, a struggle against images that kept rising to the surface in his mind. Images, then, proved an obstacle as well as an aid to learning in that they prevented S from concentrating on what was essential. Moreover, since these images tended to jam together, producing still more images, he was carried so far adrift that he was forced to go back and rethink the entire passage...."