A new servo turned up today, so I decided to give it a workout with the 3GYS programmer. I have a couple of other cheap servo testers, but they don't work as well as this 3GY-BOX.
The servo I tested is a Fitec FS9357D. Servo speed showed 0.064s at 5.11V and I could still feel the deadband test pulsing the servo down as low as 1us.
Auto run mode at maximum speed (100) had the servo toasty warm after 5 minutes, so it can be used for a pretty mean burn in test. I left the servo running for 10 minutes at this speed. I then ran the servo for an hour at a speed of 40, and it was hardly warm.
The servo tester side of the 3GYS is a really nice bonus.