stones are 8.6 inch diameter at 100psi with 5.7 inches max stroke and only 1,420 lbs force at max stroke at 80psi slams are 7.75 inch diameter at 100psi with 8.2 inches max stroke and they have 2,821 lbs force at max stroke, so the slams are smaller diameter, have 2.5 inches more travel and put out twice the force of the stones so its your call if you wanna see the specs for yourself checkout
http://www.slamspecialties.com/ and go to compare