At my company (aircraft type, L1011), there are no autopilot restrictions, except that it must be used for a CATII approach....no other altitude restrictions.
In fact, the autopilot can be engaged in control wheel steering (CWS) even for takeoff, quite handy during a complicated SID or noise abatement departure procedure, especially where low level turns are required.
And, of course, automatic approach/land (autoland) operations are a TriStar specialty....four channels of autopilot guideance, superb.
However, most pilots hand fly approaches, unless CATII.