In the beginning the Kahr K-9's rubbery grips felt better to me than a Glock 19, which felt like holding the proverbial 2 x 4. Then I began shooting both extensively and I found the K-9 grips just too thin. Now the G-19 grips feel "just right." Funny thing is, the G-26 grips does not feel as "ergonomic" as the G-19, but I shoot the G-26 better. It has to do with where the hump is on the grips.
Own 4... the only one I felt I had to modify was the large frame second generation G20.. Some sanding down of the nubbles where the heel of my hand rests and both left and right edges of the grip front improved the feel immensely. So now it's more rounded at the front and sticks out less at the bottom rear.