Here's one more data point for you, Paul
We have now been through 3 wheel-mounted autopilots (not that I'm bragging about it, mind you...) and hope this might be helpful. FYI our WHOOSH is 11 tons and 13M/42' LOA, far in excess of any wheel pilot's rating...but most of our self-steering is done by a Sailomat vane with or without a Raymarine 1000+ tillerpilot. Our wheel pilot is used for straight motoring and light sailing conditions, if then.Navico/Simrad WP300 - purchased in 2000 and used for perhaps 3000NM, Chesapeake Bay and ICW (twice) - intermittant contact failures that led to loss of reliable steering; clutch release gave us some problems when the above failures happened and the helm loaded up; the pedestal-mounted plastic molding was done poorly and, after a second unit was sent but also mis-molded, I had to 'remanufacture' it; contact failures were repaired under warranty but some grousing from the FL Simrad folks; it now sits under the V berth as an 'ultimate' (reluctant) spareCPT - across the Caribbean and one TransAtlantic plus local N European cruising; perhaps 7,000 NM but used in the same sparing way as described above; supposedly the 'tractor' of wheel pilots; we named ours Boris because it looked like/performed like it was of ex-Russian military heritage; it failed to hold course due to motor creep any time the helm loaded up with even light weather helm; either its course sensitivity and/or steering controls were pretty coarse and having it hold course within 5 degrees (just motoring) was the best we could hope for. IMO it's not surprising that Scanmar has abandoned building these, after purchasing the rights from Charles Pukit, the original CPT inventor/owner. I have 2 spare belts if anyone's interested.Raymarine 4000+ - had one airshipped to Kiel, Germany in 2004 (CPT plastic gears in the compass finally gave up); used for perhaps 2000NM to date in the Baltic and North Sea (but again, used only as described above); the electronic design thinking is entirely different (from Simrad unit) with the control module bulkhead mounted and intended to be integrated with other electronics; (hidden) belt comparable in size/design to Simrad unit; cluth mechanism appears to be stronger; I'm very impressed with its performance to date and notice it seems stronger than the Simrad. However, rate of course correction is slow (note the small muffin fan-like motor) and you can only expect so much control from it, even on small boats, in heavy air and big seas.I'd grade the 3 units, overall and to include the performance of the companies which are behind them, as 'C', 'F' and 'A' respectively.Hope that helps.Jack