It's a great exercise, can be a little rough on the shoulders. With close grips it's easy to cheat and flare out the arms, which takes the tri's out to some extent. Reverse grips force your arms close to your torso or you'll end up with the weight on your face. Make sure you've got a hand off guy you trust, he'll have to swing it out further than a regular bench hand off. Use your normal bench grip width and touch the very bottom of your pecs. Anthony Clark benched 780 like this, with a bench shirt.