Completely agree with higginsd. I have a range of watches from Omega, Rolex, Breitling, IWC, gens and top reps and the 3777 rep holds its head high in that company. Only one person ever noticed the 3777 as an IWC and they admired it. Most people have never heard of IWC even if you tell them the make. They would need to be a real IWC expert to spot it was a rep and even then, are they really going to ask you?
The 3777 bracelet is superb as well. Mine feels like a gen bracelet, not like the Breitling rep bracelets for example.
Most watches are quartz and you need to be quite close even to be sure that the 3777 secs@9 is sweeping not ticking.
For me, the rule is to wear the watch because you like it, not because someone will think it's a gen.