I've used them 2X + and had no problems. I was "around" and the tech showed me the tires readout on the machine, rotated a tire on a rim, swapped L and R side rubber on other track tires, put the weights where I wanted them, etc....
Was very convenient for me, all work done at my house and I could continue to work on other things (cars) while it was going on.
FWIW
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