My experience with this servos is bad. I bought two and both wouldn't center at all. They would hunt and then stop...but if you gently put pressure on the arm or re armed them they would move to a different center. Very weird behavior.
Like I said, I bought tow of them and tested with two different radios and receivers. Both would move on their own between two different centers. Totally unusable.
Most of the gear I've bought from VH has been good but these were dogs.
I love VH but for whatever reason.....these servos were.......bad.