Chiming in late and putting in a good word for Raymarine. I installed mine over 5 years ago (specifically a
SmartPilot X-10 course computer, a
p70 control head and the rotary drive unit) and no problems at all. The integration with their chartplotter is excellent, but presumably it would work well with any NMEA 2000 equipment.
You can read more about my installation here:
blog.arribasail.com/2013/01/tech-arriba-gets-autopilot.html