I ordered one of these to get an idea of the build quality and overall scale before deciding on a R&P system opposed to a belt or screw one. It is a great component and will make for an easy build. I have one addition to the assembly instructions online, that is pay close attention to the thick lock washer placed under the main gear, it may have a deformation on it that rubs the gear even after fully tightening it down creating a tight spot. Removal and a quick filing near the outer edge made for a perfect assembly.