My X had a swollen battery so I took it into the Apple Store today. I expected to have to pay for a new battery and repair since I am long out of my warranty. The battery was so swollen that the screen had separated from the body on the entire left side of the phone. The Genius took a look at it and said that it would be 'too dangerous' to replace so offered me a replacement phone for the cost of a battery repair ($89 -- I am in Canada). So my plans for a new phone are on hold since I really don't see the compelling reason to upgrade from an X to a 12. But Apple will get my business in the future, that's for sure. Kudos to Apple.