The coil can hurt for a split second as it is put in. The first 6 months can be a bit irratic with bloating, stomach cramps, moods and irregular bleeding, but after that it seems to settle and you can have five years period free. it can also control moods and pmt, but like with everything, everyone can react differently; some people don't experience any pain whatsoever as it is put in, nor do they have irregular cycles etc, while you will also hear the horror stories from others! The marina coil is usually given to women with cycle problems and heavy bleeding - is there a reason why you want the marina?