Interesting article, but that guy could have avoided some suffering if he knew about ways to lessen pain without anesthetic. A common technique used by body piercers is to numb the area with ice beforehand.

Really though, most of the benefits of those things don't require any cutting. Why not wear the RFID tag in a bracelet? Why not temporarily glue rare earth magnets to his fingertips? If that guy ever needs an MRI, he'll have to get the magnets removed from his body. If he's in an accident and the doctors don't know about his magnets, the MRI could injure him or damage the scanner.

Edit: Oh, he has a blog. It's umm... interesting.