Jock
I agree, sitting behind the thing wondering what it is going to do next is far more stressful than flying the ILS manually.
I did some years back read an accident report from the USA about an under confident pilot who relied heavily on the automatics, unfortunately the automatics let him down with a fatal result.
In my opinion you need more skill to identify and correct an autopilot malfunction during an approach than to fly the approach manualy, the conclusion being that old and unreliable autopilots are a hinderance rather than a help for those pilots new to instrument flying.