I was given a set of savox last yr for a gasser. No complaints. I have also 8411s and they still are good. Have some spektrum 6030s on some. Don't center as well as I want so relegated to flaps and such.
i'm still running a set of 5955 s in two jets with zero slop. On 5955 and 7955 when the settings are tightened to lowest setting they center fine for me
The only servos I have had flounder were older 2721 analog JR servos. Only total failure was in smaller stuff like HS65 mini and little jr.
fWiW