No worries with the ones I've used. 120+flights in my Elan. They are relabeled Savöx servos, which are very good value. The 6030 equals the Savöx 1256TG which is a titanium geared 20 kg aluminium cased servo. Futaba arms fit the Savöx. Compared to 8411 for instance, titan gears, more rigid, just as fast, and a lot cheaper. As almost every rc car enthusiast uses them for steering, I have to believe they're good and take a lot of punishment.
TP.