Why is it so expensive? it's only 28 oz-inch.

Its lightning fast and made to accept the high frame rate from a 401 gyro, a tail rotor servo is really its only intended use and it excels at this.

get the S9254 instead as is more powerful and still asfast ....
price is very similar too i think,,

The 53 has been discontinued, whats on the shelves is just whats left in the supply chain the 9254 is the current servo.