i had one for 8 years
pros: none other than looks and every girl wanted to see it.... if you happen to have a good chest your in for some extra attention too lol
cons: hurts like a mofo when you get it done, took ages to heal and now i've taken it out i'm left with two holes on the nip
dont get it done IMO
also had an eyebrow piercing at one stage, that lasted all of 2 weeks as i was putting on a motorcycle helmet every day