Andreas,
I agree, sometimes it is difficult to spot the difference in some of the pics posted. I have owned the rep, and have seen many gens. The white rehault ring that overlays the dial of the watch (between the dial and the crystal) is about 2mm-3mm too wide on the rep. As there are many of these reps around where I live, I find it to be a very 'easy to spot' flaw on the watch (besides the lack of strong a/r).
V is right, this is a very beautiful 'macho' watch; however, the rehaut problem led me to sell mine. We don't wear our reps to claim they are gens, but what's the fun if there's no mystery...