For the last year or two I've been programming and running a Partner III and an RW-12, both with the Centurion 6 control. I'm now looking at machines for my home shop and I am wondering what the main difference is between the Centurion 5 and Centurion 6 controls. Is the extra cost of a machine with the Cent. 6 or Cent. 7 control worth while for someone who programs almost exclusively by hand and with CAM software?