I have both the gen and the rep of this watch! Bought the rep for a lark, just out of curiosity.
I have just two comments:
1. The rep in this case is, in my opinion, 99% like the real McCoy in terms of visuals. There are slight differences in the 12 o'clock and 6 o'clock rings, and very minor differences in the dials. In my opinion these are hardly noticeable. So wear your reps with assurance!
2. NOBODY, and I mean not one blessed soul, has, to date, asked me to engage the split second function on even my gen watch (I have worn it maybe 10 times to different events)
Most people you meet, contrary to your internal convictions, have no clue about this watch other than it "looks rugged", and no clue on what a "doppelchronograph" may be. Those that do know, do not need to see it. The gen-snobs you meet might demand you show it to them as a proof of its authencity, but hey, thats when you stare them down for their impudence, until they shrink to an infinitesimal speck of dust in your sight.