Been purchasing tires from discount for many years (6 sets so far). I have been to several different locations around the east valley and have been pleased with the service and the quality of the tires I get there. They came out with this policy a few years ago that if the tires you had weren't from them, they charged you $15 for a flat repair, but if you replaced your tires, you would get that money back. They only did that once for me. The last couple of vehicles I have had, they fix the flat at no charge, no matter where my tires were from. They know I have bought enough tires that I will be back in the future.
Over-all very pleased with all of the discount locations I have been at and the service level. Will be back again for new tires when the time comes.