We ordered Autopilot from Raymarine (Sept 07) but due to forthcoming update cancelled, and will wait for new version launched now.
As example this long weekend Thursday Southamptomn to Salcombe (5 hrs) then today Plymouth to Soton (5.7 hrs) the autopilot would have earned its keep. I know having sailed yachts.
Will have one before year end, allows exta time for observation.
Apparently there are two types and the gyro compass (is the one to have)
We only steered 2 courses but due to very poor vis and nothing ti aim at had to constantly watch course 'roadway' and make constant corrections.