I at once owned a 5711/1A, a 5712/1A and a 5980/1A, ultimately selling the last two and keeping only the 5711/1A. I am probably in the minority on this forum in preferring the simplicity of the 5711/1A to the complications of the 5712/1A and 5980/1A. I believe that what distinguishes the 5711/1A from the other incarnations of the Nautilus, however, is the melding of the horizontal lines of the links of the steel bracelet with the horizontal lines of the cushion dial, resulting in one uninterrupted, seamless piece. it's a matter of personal preference, of course, but even after four years of owning my 5711/1A, I have never tired of admiring its elegance.