T'is a very odd and unusual watch; definitely not suited to everyone's taste, but I'm still drawn to it. I recently saw a pic of Cartier's ID One Concept; same case as the Ballon Bleu, but with a one off movement specifically highlighting the following properties:
-No adjustments or regulation required
-An escapement that will maintain an accuracy of 2 seconds per day for the life of the movement, without pallet jewels and with minimal trips to service/overhaul
-No lubrication
ID One aside, seeing the Ballon case on a kevlar strap really appeals to me as it adds a bit of a sport-watch element to this otherwise dressy watch. Someday, I may even give this one a try