Nobody sees the movement while the watch is on the wrist so that shouldn't be a dealbreaker. But if it is for you you should get a closed caseback (ROO). The 15400 is a fantastic AP and I really love mine. I would advice you to get the TF and not the latest V6F which is thicker and that's a no-go for me on a slim watch like the 15400 The rep movement just a decoration, it looks nice but it doesn't look that good as per genuine mate.