I have had a love hate relationship with my implanon. It was great at first. Went through a phase where I bled for like a month straight. But it seems like the hormones have kind of calmed down and I have a regular cycle now. Like a 5 day period approximately a month apart. And they have been getting lighter and shorter so I'm expecting them to stop soon. Haven't had any side effects like hot flashes or mood swings either.
Implanon was horrible for me! I gained 40 lbs, bled heavily every 2 weeks for over a week at a time. Had terrible cramps, mood swings and headaches. I hated it. Now I have Mirena and love it! I'm still losing weight, no bleeding at all (except I spot for a day every month) I do have some irritability but nothing like with Implanon. No issues for me.
With Mirena I had horrible mood swings, a lot of weight gain, no sex drive, it hurt to have sex, horrible back pain, and DH could feel it.
With Implanon I bled for pretty much 10 months, constant migrains, and severe depression.
The pill works best for me.