I had taken my car to this location on 9/13 to have a road force balance performed on all 4 tires. I didn't realize what they had done until just a few days ago.
For those who do not understand what a road force balance is, a machine places a rolling wheel on your tire when mounted on a balancing machine. This wheel measures any feedback it receives from a tire while it spins. Some call it heavy spots or high spots. The point of a road force balance is to reduce noticeable vibrations by "match mounting" the tire to the rim in the best possible spots. All tires have heavy spots, and all rims have heavy spots. The process aims to find the best spot in which the tire is mounted in relation to the rim. For example, GM places a maximum RoadForce value of 15 on tires mounted on their vehicles.
Back to the day of the road force balance. Each tire they tested on the machine. They placed a mark on the tire and on the rim. All of the tires, the marks were at 180* opposite of the rim mark. They then rotated the tire and aligned up the two marks then balanced the wheels. THEY DIDN'T EVEN TEST FOR ROAD FORCE AGAIN TO SEE IF THE FEEDBACK WAS BETTER, WORSE, OR THE SAME.
So, essentially, I paid (quite a bit) for Discount Tire to rotate my tires 180* on the rim with no documented results afterwards.
By the way, I still have my vibration problem, so it's safe to say that they didn't perform the Road Force balance correctly.