for cleaning, i like using one of my bipods... helps me position the gun exactly how and where i want (usually the butt on the coffee table, slightly muzzle down). it is right where i want it for cleaning so i am not in an uncomfortable position.
for scope mounting, bedding, trigger work, base bedding, etc etc etc, i use a plastic mtm one.
for shooting, i use a bench w/ proper rests. i tried one time to use the mtm thing to shoot from, and i would hope that nobody else will have the misfortune of using it for that, especially in a rifle that has some kick.