IWC always relied on third party movements: ETA in Aquatimers and Mark XXx watches, Valjoux 7750 in chronographs. Even their grand complication is Valjoux 7750 based. IWC always improved upon and finished the "basic" movements to the high standards. So I would see the use of these movements more of the company DNA. If the movement still bothers you however, I would suggest you look at the original Jumbo Ingenieur. There will be a cost difference though.