I found this on my computer, forgot it was there.
Sorry for the poor quality of the video but it does demonstrate just how smooth the turntable works.
Video was taken during the rebuilding of the Granville Junction roundhouse to accommodate the 90 foot turntable replacing an old kitbashed 1960s era Airfix hand operated kit.
http://dl.dropbox.com/u/17855079/2004%2006%20Jan%20001.AVI (http://dl.dropbox.com/u/17855079/2004%2006%20Jan%20001.AVI)