Great little servos, can't beat the price!
These little guys are great. They were sold out for a bit and I ordered a similar pair from another website that were some generic brand and they are both flakey. Biggest difference is the speed and crispness with which these servos adjust. I own six of them and have yet to see a failure or malfunction!
Good performance, light-weight servo
Using these ES 9051's in a Malibu 1m DLG and some MiMi DLG's- they are nice and small, light-weight and more than enough torque at 4.8V (.8kg) to drive the Rudder and Elevator on the MiMi's and drive the flaperons on the Malibu. Inexpensive as well! Perfect for smaller DLG's or indoor flyers. I would not use these on anything bigger than a 1m wingspan glider or small electric.