If you have realatively large hands, the Nills seem to fit well. I have a lot of trouble with standard stocks as my middle finger knuckle hits the rear of the trigger gaurd and after 50 or so rounds, gets pretty beat up. This causes some flinching.

The Nills, and Hogues for that matter, throw the hand into a lower position and the middle finger knuckle misses the trigger gaurd, relieving the issue. Especially the finger grooved style.

My 2¢.