I got nexplanon just over a year ago now. To be fair, it has done the job intended and I have never been pregnant. However, it doesn't come without it's side effects and that counts for my friends on it as well as my own experiences.
My periods have only just calmed down recently, and until then the pain was literally unbearable! I had to have days off just because I couldn't deal with it (and I generally have quite a high tolerance to pain). My skin has not changed much, but I have put on weight and am constantly hungry. The worst thing for me is the constant mood swings though. I change from happy to pissed off in about 0.63 seconds sometimes, I cry at every single thing under the sun (my favourite one so far is crying at Take Me Out). Also, my sex drive has been unpredictable to say the least.
Despite the never ending list of other problems I have had on it, I wouldn't remove it as the other contraceptive options just aren't suitable for me and my main priority is not getting pregnant. I'd recommend it because everyone reacts differently but be wary of what could happen, especially if you're a bit of an emotional drama queen anyway!!