I kinda feel like a big yawn coming up.... GPS? for me, wouldn't use it, couldn't care less about it... I could see why some could use it, buttt...... As far as eye control... I used a camera in school , i think the 1v or something like that which had the eye control... It seemed kind of neat, but to play devils advocate, I got an open question/comment I would be interested in hearing responses on...
while I never owned the camera and have limited experience, it was alas on a film 35mm camera... most 35mm film prints on average were 8x10 and smaller... On occasion if you felt daring enough, professionals would print that film at 11x14 but that was the exception to the rule because of film grain and the prints, if shooting ISO 400 or larger, would be just too ugly to print bigger than that. Now we know with digital, when we print an 8x10 vs printing 16x20s, the 8x10 can hide lots of sins and imperfections of lenses and such... some minor AF inconsistencies may even be hidden on a 8x10 vs bigger depending on the severity. While people have fondness of the eye control, could it be that in practice, on a camera such as the 1d, 7d, 5d2, 5d3 whatever that the eye control was good but may not be 100% perfect in which it could be intensified on a camera that natively pumps out 11x14's-16x20's? While on smaller prints the imperfections of the systems may be easily overlooked but on a monitor, blown up at 100% or greater in this day and age of pixel peeping, having the eye control could be a liability?