I have used SA and CP. I have S&T 2005 also but have not been motivated to play with it. I liked some things in SA2003+ like the dvd phonebook and the mobil map colors(black background with white roads) custom poi icons and how easiy it was to just pick a point on the map as a destination. The interface and guidance was terrible. I now use CoPilot 8 which is much better for touchscreens and guidance.
I have used the new earthmate, holux gm-210 and the rikaline 6010(shipps with CP). The earthmate was just terrible, trees were a problem, hard time locking and almost imposible going over 50mph, . The holux was great, no problems. the rikaline was just as good.