In regards to suitability, my Dr recommended to me to have Depo first because if the depo didn't agree with me, then more than likely the implanon wouldn't either. The depo made me gain a few kg, then I couldn't lose any weight at all no matter what I did, I had no sex drive, and I had the on-off bleeding too. So all of that made me steer clear of implanon, but I have had friends use it with no trouble. It's no different to any other hormonal birth control - there will always be people that it doesn't agree with or work for.