I for one used to think it is an "after-market" option and was a little wary of resorting to it. I've seen a lot of people around me, either who like me, have a "choke" fit where it is fine during cooler days, but literally struggle on hot and humid days, which in Singapore is like everyday. Then there's those who wear it extra loose, the old "Rolex president fit" where the Nautilus is literally dangling in the air from the wrist. Among the two predicaments, I chose to live with the "choke" for a good few years (really hated the "Rolex dangling look").
Now, my god, I can't express how happy I'm with the Nautilus. My other watches are going to get used to the storage for a while, lol!