I did. I didn't for my 3G and a few months after my 1 yr mark hit it died. AT&T wouldn't help and Apple wouldn't look at it without Applecare. It was the most horrible feeling knowing it was before my contract was up so I couldn't upgrade to a 3GS cheaply AND I knew the IP4 would be out in a few months so I didn't even WANT to upgrade. I really thought I was gonna be stuck with a hideous dumb phone for like 4 months. Thanks to the forums and some googling, I was able to fix it myself - but having the peace of mind that if something like that ever happened again and I wouldn't be lost is well worth the $60 IMO. Plus, I don't plan on upgrading until 2012 unless the next phone is something so unbelievable I won't be able to pass it up.