Savox servos are great at the price point. Be careful if you are planning to run the servo from a esc BEC or a Spektrum radio as they are quite power hungry and weak esc BEC's and Spektrum radios struggle to keep up with them sometimes and brownouts can result. I have run Savox standard and HV servos without any issues running Tekin/Airtronics combo.

I'm not a fan of anything from HK (get what you pay for I'm afraid). Been bitten a few times and would never buy anything from them again....