Their frozen drinks carried me through last summer. They have free air (for your tires) and water (for the radiator) at every location I've ever been to. Their hot sandwiches, though greasy, aren't TOO greasy and actually taste like food. The coffee is pretty good, and they have more ways to tart it up than Starbucks does. QT frickin' rocks.
And BTW, the QT stands for Quick Trip.