Having owned way too many reps and having loads of them junked lying around. I love this replica, in fact, I love it so much I bought the genuine article. In my opinion, the only major difference that is quite easy to spot is the genuine version sail cloth strap seems to be kind of waxy/glossy in comparison to the replica which is more Matt in texture. The differences, in my opinion, are quite stark.
Apart from that it is extremely hard to tell the difference between the two watches. Unless of course you pop the backoff.
Best rep out there bar none