I've had bad experiences with a couple of dealers (TDs of another forum, and not this one), and that pushed me to buy gen.
The problems I've encountered were really discouraging (e.g. date wheel on a PAM was of a completely different font and not PAM-like at all, the engraving on the back was of a completely different ink color, the bezel on the rolex was off by 4mm, the backside of the IWC was very different from the QC pics). I then caved and purchased a pam510, and I've been having a lot of fun dressing up the watch with different straps ever since. I also have the peace of mind that if I let someone wear the watch, I wouldn't have to worry whether someone will scrutinize whether it's a gen or rep, because I can confidently say that it's a gen.
That being said, I am keen to buy rep pams from this point on, until probably my next life's milestone. I'm particularly looking out for radiomirs now, and keen to get my hands on a really nice 448, 449, and 514.