JB:
I'm missing the first joint of my right ring finger, so I find the push-tab design to be helpful in a pocket holster. Using the thumb to push off the holster when drawing the pistol now seems natural to me. (One learns to adapt. :-/)
This is my Hedley rig for the R9:
(http://i2.photobucket.com/albums/y30/RichardS/aug27_02.jpg)