It's a nice option to have
It's a nice option to have this feature available from the tire manufacturer. I had to repair 4 nail/screw punctures so far this year, and happily they were all slow leaks and the tire repairs were covered by an added tire warranty that I bought when buying the tires. I don't like fix-a-flat, spray in tire goo, because it can cause a tire imbalance, and often the tire cannot be patched/repaired afterwards.