I am using JR 8411 servos on every flight surface along with a Hitec 645MG for steering, Hitec 225MG for brakes and Hitec 225BB for retracts.
In an attempt to overcome Infant Mortality, I have put each servo through a series of runs using my servo Xciter Jr. I bough this on line for $24.95 shipped right from the manufacture who offers a discount for AMA Members.
I put a total of 60 minutes on each servo over 6 ten minute runs with a 10 minute cool down between each run. During the test you should be present and actively listening for any odd sounds such as the servo skipping. Also watch the servo wheel closely to verify smooth operation with no skipping or dead spots. Here were my runs:
1. Medium
2. Fast (really heats things up)
3. Slow
4. Medium
5. Medium
6. Slow