IWC caliber 69355 vs Valjoux 7750

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Hello,

I was looking at the blue panda version of the IWC portugieser chronograph the other day. I liked it quite a bit but I was wondering about their new caliber. Does anyone know how it differs from the 7750? I also wondered if anyone had heard anything or had any experience on whether this new caliber is reliable or is still having some growing pains. Thanks!