well, i heard one horror story about sack piercing and it was enough to make me say "no thanks." besides that, i think if you're going to get a genital piercing, it should have a purpose, not just for asthetics. don't get me wrong, i like my balls played with as much as the next guy, but getting a ring through them wouldn't do very much for me. plus it'd be a royal pain in the ass to shave around a stud in the nuts.
i'm sure a sack piercing would hurt less though, but i'm never doing another genital piercing again. this one hurt too much. that being said, this one won't come out unless i absolutely hate having it. i didn't go through that torture to remove it and then come back and say i wanted it done again.
damn, i still can't believe i had the balls to get it done. wow.