I have been using the digital servos from hitec for awhile now. If you want to talk about centering problems then you must be referring to the lower end servos such as the 605's... These servos have great torque but do have a serious centering problem.

Myself and several other in the area have been using the hitec digitals in everything from a 1/4 scale cap to a 1/3 cap and 30% edge. There are no centering problems with these servos and if you get the programmer then set up is a breeze.

If you compare apples to apples (high end servo to high end servo) then the HITECS are unbeatable for performance or price.
Just my.02