"i have had this in for about 2.5 years. it works in that i have not gotten pregnant.  i have a very light period for 1-2 weeks every month or so.  sometimes 6 weeks in between &#039;periods,&#039;  sometimes only 2 weeks. it&#039;s very unpredictable, can ruin a lot of &#039;underclothes&#039;. also, i cannot get back to my pre-birth control weight. i used to weigh an athletic 145 with a diet of whatever i felt like eating and exercise 4 days a week.  maybe its age, but now 2.5 years later, i can exercise 6 days a week for  twice as long, and watch what i eat and am stuck at 154."