I would have rated it with 5 stars, however, because the stepper driver IC's are soldered to the PCB, expand-ability is limited to what is on the board. This is just my opinion, for example if you want to add a second extruder, you can't. Also, the two Z axis driver outputs are linked e.g. just one signal split and present on both connector (ZMA / ZMB). I believe this is a setback, if you need independently controlled Z axis control. For auto X axis leveling, for example.The sad attempt of contrSee full review