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Personally I am only working with Roomba5xx and first tried to use the original Create sources to get a turtlebot running (before Roombas were supported at all). The odometry values coming from roomba were terribly inaccurate and also depending on speed of movement. Once I switched to raw encoder values all these problems were gone. I have no absolute values for you (since the error also depends on the acceleration and the floor material), but I can drive several meters and experiencing an error within centimeters (in my case less then 1%). Please feel free to contact me for further information.