The RO looks great on your wrist and looks great period, full stop. If the 15400 fit me as well as it fits you, I would much rather wear it than a 5711; it's a better-looking watch and has at least an equal pedigree. The RO also is very unlikely to depreciate in value at this point. In contrast, the 5711's current price is almost certainly inflated -- more than twice as much for a model essentially equivalent to this one? -- and is thus subject to correction over the next few years. Anyway, that's my 2 cents.