At the beginning the "hamburger" shape was really not my thing.
But the more I saw the 3970 for instance or this 5004 in pictures I feel the charm indeed.
Concerning the reliability, I don't know, but I heard about there was a possible "update" during servicing time.
From the Patek watchmaker I could talk with, the movement seems to be so difficult to reduce that much that I can eprsonally imagine they could have been facing this kind of issue at the beginning.
Thanks Nicolas!
Cheers, Mark