My custom printer is based on the Prusa MK3S design, so it uses Prusa's heavy direct drive extruder. I needed an X-axis motor with more torque in order to reach at least 15,000 mm/sec^2 acceleration. With smooth input shaping on Kalico (a Klipper firmware derivative), I was easily able to reach that with this motor. I printed several test prints with aggressive speeds (80-150 mm/s) and had no issues. It is quieter than my previous motor, which is nice. In terms of quality, it is comparable to the other big brands of motors. This thing has great bang for the buck.