Squidslayer, I think it is what your experience is. I have been installing auto pilots since 1962 (about 45 years)--One of the early ones I had was from a B 24 bomb site. The reason I prefer to install my own electronics (including auto pilots) is that when they break, you have a much better idea how to fix them. I have sailed over 100,000 miles under auto pilot control, and there are breakdowns, even in the best. (One of which is the Will Hamm).
Since I already have the circuits in place, and know where to put the bracket for the flux gate and the pump set, the rest is basic plumbing and setup. Even if the dealer sets up a pilot, there may be times when you have to re-calibrate it, so it is very good idea to know how. Agree however, that a TC 255 is different than a passagemaker--and the loss of a pilot is not a big deal--and is the reason so far I have not put a pilot on the TC 255. (I don't like to run fast boats on auto pilot for safety reasons. If you consider the boats which are run aground each year, a surprising number were on auto pilot.