Discount Tire add on insurance

I had an issue with 2 tires on my rig showing sidewall cracking on tires that were 2 years old. I had bought the Discount Tire extended warranty. They replaced both free of charge. I did have to pay about $25. each to reissue the replacement certificate. Not sure why the variable price but still what I considered to be a great deal.
More than got my money back.