Yes I've fitted lots of them and they are now the only system of this type I fit, but they are not servos, they are a Closed-loop stepper system.
That basically means they are just a stepper motor with an encoder on the back, the drive then tracks the encoder to make sure it moved the command distance(pulses). They come in two basic types with 2 phase or 3 phase motors, the latter being the better option as they are smoother and more powerful on a size for size basis.

Real servos work very similar in regards to checking position but work very differently in how they drive the motor and are much more powerful with advanced features. They are also more complicated to set up and tune. Not something I'd recommend to a new user