I also like the "New York" design. The prototype of the R9 had a slide stop, as can be seen from the accompanying photograph from SHOT 2002. However, as I understand it, Karl and Eric decided to eliminate the slide stop from production models as an unnecessary complication for such a small pistol.
(http://i2.photobucket.com/albums/y30/RichardS/RohrbaughPrototypeat2002ShotShow.jpg)
I remember my reaction when I first saw that photograph. It was something of an epiphany, and I immediately fired off a letter asking to be placed in line for one of the first R9s. I took delivery of R9 No. 132 on May 14, 2004, and it has been my EDC for the past decade.
I'll concede the point on changing out the grip panels:
(http://i2.photobucket.com/albums/y30/RichardS/Rohrbaugh%20R9/R9withElephantHideGripsHolster_zpseaa27afa.jpg)
8)