Yes....these are the same servos Curtis is using. The 8411 is known to be a bit sloppy in the gear train due to the clearance required with metal gears. Since the SA version has nylon gears there is virtually no gear lash but as the cost of output torque the gear train is capable of handling. Although there is a bit of lash on the 8411, I have never had a problem with them nor have I heard of anyone fluttering one because of the lash. Guess it's just a matter of application and personal preference as to which version you would use on a jet. IMHO....No, there is no real advantage to the SA for jet application except they are slightly cheaper than the standard 8411.
Todd