I'm in the research phase of buying a new CNC machine and am keen on getting a machine that is smooth and quiet. My present CNC machine chatters/resonates way too much. From many accounts the shopbot desktop seems to be a smooth machine. But then I come across a video like this:

https://www.youtube.com/watch?v=-sD8wBcuevg#t=616

The noise at 10m:20s sounds awful. The owner seemed to indicate the noise was normal. Do other owners experience this same noise? If you have video of the z axis moving up and down that would be great.