I installed the joystick without issues, and I am overwhelmed by the feeling of a proper joystick under my thumb.
However, for comparing the precision to an original stick, I booted up the Ekans minigame on Pokemon Stadium, which depends on a properly calibrated Y-Axis, and I noticed the stick acting like being fully pulled when it's only 60%.
Most games don't need this precision and you will always be more happy with this joystick than with a broken one or a knockoff.