Implanon
"I've only been using this for about two months. But so far, its fantastic. I'm, not pregnant. I'm not sick, or depressed. And I'm still pretty normal, in every other aspect. 
The injection was basically painless, other than the numbing stuff, and a big nasty bruise afterwards. But that goes away in about two weeks. 
In my opinion, this is the best birth control available."