birth control
"I've been on this contraceptive for three years, and overall it has been OK! Before I got it my periods were regular in length and amount but not timing - they could turn up any day. They day after I got this implant I came on my period for a normal length of time, and have not had another one since. Needless to say this has been great, not having to buy expensive sanitary products.
This contraceptive also does what it says on the tin - after three years of mainly otherwise unprotected sex with my partner, I'm still not pregnant. 
My only misgiving is that in the weeks after getting Nexplanon, I got some mood swings. These calmed down over time, but still crop up occasionally as grumpiness (usually directed at my poor partner!)."