i run these servos on both my throttle and steering!
ok i admit they arnt popular and not many people use them but its what i have found to be most reliable.my steering servo on my old car actually vibrated so much on the chassis that the servo cooling fins cut 1mm deep lines into my 4mm hard anodised chassis!!!!!!
i have never had one fail on me and i have a few buddies that use them for 1/5th scale.
one guy had two linked up to work the steering in his 1/5th scale (like the lst monster truck) and he forgot to plug on of the servos in so he did a 10 min race on one steering servo !!!!