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I implanted my Firefly V2 on Oct 19th (yesterday evening). I put it below my left collarbone, and all in all, the procedure was super quick and relatively painless. It certainly hurt less than implanting my V1 in the back of my left hand.
I had one friend hold the camera, but managed to do the entirety of the implanting by myself. I put some neosporin and a bandaid on it after the (very minor) bleeding stopped, and today it looks like it's beginning to heal very nicely. There is some bruising all around the implant, and the site is tender. The implant clicks very loudly if I tap directly on it with my finger, but I haven't noticed any noise caused by me moving around. At the moment, the implant is less bright than my V1, probably due to both the thicker skin over the V2, and the swelling/bruising in the area. I expect to have a pretty decent scar from the needle, since I still have a pretty distinct one from the V1. I'm really looking forward to seeing how bright it is once it's healed up.
Edit: Another note: When I received the package, the plunger on the syringe had been pressed, so the implant was loose inside the sterilized package containing the needle. It was easy for me to put it back in the needle, but it seems that the package must have encountered some rough handling during shipping.
Here's a link to the post about my V1: