Discount Tire is an example of how well a business can be run if you provide great service and treat your customers fairly.
I noticed one of the tires was low on my wife's SUV as I was about to drive up to the White Mountains for the 4th of July so I decided to stop at Discount Tire and have it checked. I pulled up to the free tire check station and the attendant noticed that one tire was low because it had a nail in it. However, he also recognized that the tire could be fixed, and best of all, they could do it for free.
They got me in right away and 20 minutes later, our tires were good as new and I was headed for the mountains. It wasn't until later that I remembered that my wife had actually bought those tires at Costco, not Discount.
As for me, I've bought all of my tires at Discount for the past 20 years and it has definitely been worthwhile. The service is great, the price is right, and the extra $15 for tire insurance has saved my bacon a few times when I've been able to replace an expensive tire for $15-20.
I wouldn't buy my tires anywhere else.