I like the Pachmayr "Limbsaver" slip on. I have "ape hanger" arms (my gunsmith's term, not mine) and need more pull on most guns, especially those that kick, to avoid "knuckle nose."
All you need to remember about pullovers is that you need to pull them off and check for moisture buildup every so often, especially right after you've hunted in the rain or snow.
Moisture buildup under the pad will eat the wood stock finish and wreck a metal buttplate. (DON'T ask me how I know that!!!)