You know the ones with the safety pins. I don't have a spotter at the moment so I've been using them so that I can max out each set without worrying about potentially crushing my ribs. But they certainly don't feel as difficult as the regular benches since they take away the element of working your stabilizers. If my 1rm bp is ~225 lbs on the Smith, would that be around 205 for the regular benches? How much extra weight does it typically overestimate?