We have an older Simrad/Robertson AP-11 with the hydraulic drive on our boat. (The current version would be the AP-24). Our unit has proven to be extremely reliable and function under even extreme conditions of wind and seas. Several of our friends have Raymarine units and have remarked on the difficulties they've had and frustrations with Raymarine Customer service, or the absence of. I would suggest the Simrad.
"It is not so much for its beauty that the sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."