I was staring at pics of the Gen as well as all the images of the U2 I could.... It's an awesome replication for sure, but I think the U1 has less tells. Besides nitpicky bezel and dial details I won't go over (unless I had them in front of me or see better images), I could plainly see that the GMT hand is a bit longer on the rep than it is on the gen. The gen hand just skims above the GMT time markers, and the rep seems to go over the number a bit on the images I've seen.
Other than that, it's clean out of the box. I don't know of anyone that would go as far as to mod the dial and hands on these just YET. The big question that we've all been asking is...will a gen bracelet fit? Cmon someone, shell out the $300!
Oh and congrats bro, don't mind my analysis, she's a beaut!
kdx