I had it put in last June at Planned Parenthood. My insurance covered NONE of the costs, and I didn't get any financial help from PPH (because of my family income). It was around $800 for everything-- a few tests I needed done and the insertion process. The numbing shot was a bit painful, but otherwise the insertion was fine. My arm was sore for a few days, and I was a bit bruised. I do have a small scar where my Implanon was inserted, but it looks like a very light freckle or mole.
I had spotting for 6 months with the Implanon. By spotting, I really mean light, light bleeding. I never used a tampon because of it, and simply wore a pantyliner daily. In hindsight, I wish I had bought a cloth pantyliner-- it would have saved me some money. I had no other symptoms with the spotting. No headaches like I had with the pill, only a few cramps during the entire time (and I'm a cramp magnet), and no mood swings. My period ended around 3 weeks ago, and I am hoping that it will stay away for awhile.
At one point I went on a birth control pill to stop the spotting (first week of November). I reacted badly to the hormones and went off of it in a week-- as a result, I had a period, and then went back to my spotting.
For me, the best part of the Implanon is the worry-free protection. I don't have to do anything, and I don't have to worry about it (a big plus for anyone anxious!).
One BIG suggestion: Planned Parenthood gave me a card that came with the Implanon. On it, it says what an Implanon is, where I got it, when I got it, and which arm it is in. It also has your Implanon's serial number on it, which is good to have. I recommend keeping this card in your wallet with your health insurance card (if you have one)! A few months ago, I had an unexpected emergency in Portugal (appendicitis). I speak no Portuguese and struggled with communication. It ended up being really important that they knew I had my Implanon, and I was happy that I had my card with me. I handed it over with my insurance information-- without the card, I wouldn't have realized to mention the Implanon at all (I was pretty stressed at the time).
Anyway, that is my story. I hope it helps someone! Again, I would love to answer any questions I can about my experience.