Bought a total of 3 used tires, 2 for the front of the car, one for a spare. At the three week mark, one front tire has failed, warping and pulling apart in the center of the tread, the second looks like it is just starting to do the same. I'm guessing these were possibly a failed retread? When they mounted these two tires, one of the lug nuts was put back on improperly, destroying the lug bolt. Which then sheared off when trying to put the spare on when the tire warped out of shape.
So.. 3 tires, 2 duds..and one bit of negligence causing damage to the car. Could be just bad luck, but I won't be going here again.
On the other hand, the spare worked to get me to another tire store, So I suppose it wasn't a complete failure.