It depends. I don't think I really have any side effects. No headaches, no major mood swings that I've noticed and the best thing is that I don't have to remember to take the pill!! Its been great for me! For me the only frustrating thing is not having complete control of cycles. Sometimes I get a bit of spotting etc but you never know when its going to start. Oh and I have also noticed that normally before my period I get a few pimples but on the implanon I seem to get them more often. So there are the pros and cons for me!