Tried on a Seamaster 300, Speedy, BB58, and Pelagos this weekend. Was pretty disappointed in the fit of three of the four. The Seamaster and Pelagos are just too thick for me and the BB58 looked tiny (I usually like a smaller watch, but the bezel just made the face look weirdly small on my wrist).
That Speedy though - reinforced my belief that I need one.