vOrtex - I'm running a Hitech 225BB " Mighty Mini " servo in my L4. So far no problems with centering. They're cheap and for the money you can't beat them for speed and torque. Yes as others say centering is big thing for 1:12's and a higher quality servo would be ideal, KO etc, but so far my budget 225BB is doing great. The only thing with the 225 though is with the standard L4 mounts, if you want the servo in the lowest position, the 225 is a fraction too long. Easily fixed by chamfering ( sorry crazy spelling ) the bottom edge of the case at 45 degrees very slighlty, about 0.5 - 1 mm so can just clear the chassis.