I now own a 5711 large size Nautilus. When I got the 5711 I sold my 3800 mid size Nautilus.
I considered the 3800 a dress and sport watch.
The 5711, for me, is more of a sport watch than a dress watch. WIth the larger size, the 5711 makes more of a statement.
Now, for normal business dress, the 5711 would be fine. But for more formal dress I think it is a bit too much.
I am almost sorry that I sold the 3800.