Of the shells that I've purchased so far, this one might be my favorite, as far as practicality and fitment. The Overseas 4500V has a polished bezel (unlike the brushed bezels on the Nautilus / Royal Oak). Consequently ,the bezel of the Overseas can easily be scuffed or scratched if you're wearing the watch with long sleeves or a jacket.
Applying the watch shell to the watch lets you wear the watch without any "anxiety" of scratches. Sure, people say that you can have it polished at service, but polishing removes metal. And servicing / polishing the watch is not a frequent thing, so it's impractical to do so each year. Protect your watch with this product, and you can enjoy wearing it without concern.