"i had my implanon inserted almost 5 months ago, in may 2009. 
the pros that i personally experienced with this method of birth contro are as follows:
-no periods. very minimal spotting.
-no pregnancy. 
-no real serious weight gain. maybe 5 lbs over the 5 month period.
while these pros are all really nice things, i found the cons i experienced outweighed the pros.
the cons i experienced are as follows:
-terrible breakouts. i&#039;ve had very good skin my entire life, up until i had this inserted. 
-ridiculous mood swings and just outrageous emotional-ness. i have no past history of mental illness whatsoever, and since having the implanon inserted, my mood swings have been insane, and i&#039;ve experienced unexplainable bouts of depression."