I had an Archer 2 with a wing leveller which would follow a heading bug and it was great for reducing the workload en route, but naff all use on the latter phases of an approach, as others have said.
I now fly a Trinidad with a full 3 axis job coupled to a GTN 650 and only fly approaches manually for practice these days. The autopilot does a better job of flying the approach to minima than I do.