Some advantages:
It’s a reliable method of birth control.
They do not interrupt sex.
Periods tend to be shorter, lighter and very regular. Menstrual cramping is almost always reduced.
They can reduce PMS symptoms.
May reduce acne.
Slightly lower risk of ovarian and uterine cancer.
Some disadvantages:
You have to think about it every day.
They do not protect you against STD’s.
There might be side effects, like headaches, nausea (the first month), gain or loss of weight, depression, decrease in sex drive, spotting and tender breasts. (Side effects sometimes disappear when you use a different brand).
You need a prescription.
Slightly increased risk of liver tumors, breast cancer, heart attack, stroke and blood clots.