The Bisley is longer than the standard Colt style grip, affording room for a better grip. The longer backstrap, with the different angle, changes the way recoil is transferred to the shooters hand. Under recoil, some roll does happen, but not to the degree experienced with the standard Colt or XR-3 RED gripframes, different still is the Super Blackhawk, and the Hunter gripframes (the difference is the SBH is longer, and has a squared off rear of the triggerguard, and is available in both stainless and blued. The hunter is the same length as the SBH, has a rounded triggerguard, and is available in only stainless).
Notice most of the heavy recoiling customs sport Bisley gripframes.