Yes, I've been with one. The gorgeous, leggy Mila from the bay area.

Of course I could tell the difference. Apperance of it notwithstanding (very natural appearing), not only is the lubrication, or lack thereof, noticeable, but so is the angle and depth. I've read others who claim to have been with a post-op say that there is no difference, but my experience begs to differ. Granted, I've only been with one, so take that for what it is worth, as I've read that many can indeed duplicate the same feel or sensation as that of a GG's, but I just can't see how that can be, particularly if you want to service her orally...It is after all, man made.

All that being said, I wasn't attracted to her to look for differences in her vagina. I was attracted to her because she is one attractive beautiful woman.