You want a high amount of torque to keep your wheels pointed where the radio is telling them to go. Furthermore, the speed of a servo says very little about its performance under higher loads. So, two servos may have the same rated speed, but a higher torque servo will probably perform better. For that reason, you will rarely see someone use a 1/12th scale servo in TC.
You'll always have mixed reviews with hitec servos. If it works fine, then great! But, you may want to save up a little more and get a KO, airtronics, or futaba servo. The complaints on these brands tend to be fewer.