The 250II added a 9 th dmx chanel mode to seperate the Dimmer to its own ch. from the middle on ch. 6 to its own on ch.7 option and had a few different gobos but it is prity much the same light I heard the 250 had a over heating issue but I have never seen it over heat , the 250II's run hot but never over heat ... I have 4 250II's and love them all I did to make them look a bit better to me is paint the covers Black I did a youtube video on how it is done.. Here is the Manual on the 250
http://www.americandj.com/pdff...ccu%20Spot%20250.pdf
thanks
mm