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Hobbysportz.com House Pilot tested this servo with hard 3D fly with FireFox Heli as the tail servo, Match with KDS800 Gyro ( 0 delay setting)
The result is "full mark".. Rock Solid straight tail even windy condition. Excellent performance and a very reliable servo

Product Description :
This servos are high performance digital servo. They come with coreless motor and special alloy shell, which can send out the heat created when working to ensure the servo can work steadily.
The servos adopts high strength and high tenacity nylon gear. They feature low noise, smooth operating, and provide best operating efficiency. They can work as the swash servos and head lock servo for 500 size and smaller size helicopters.
This N590 Digital rudder servo performance & Spec are same as Futaba S9257.
KDS-N590 SPEC:
Speed: 0.08/60 4.8V , 0.07/60 6.0V
Torque: 2.0kg/cm 4.8V , 2.5kg/cm 6.0V
Operating frequency(Hz): 300
Dimension: 35.5mm x 15mm x 28.6mm
weight: 25g