I purchased two other rotary rollers that did not work out at all for me. This one maintains good traction so you get an accurate cut. No odd errors. One of the parts came assembled in the mirror of what it should have been. Not a big problem. Be sure to look at pictures in the instructions very carefully. This unit plugs directly into the control board on the laser unit. I simply plugged it into Y-2 and unplug the Y axis motor on the laser. This makes for a simple change for either rotary or flat. I am using Lightburn software. This unit just simply works.