I recently installed a Trio ProPilot in my LNC2 (with bob weight) and with help from the Trio guys, it is up and running.

On my first 3-hour out-and- back it accurately tracked the flight plan from my Garmin 530.

In Course Mode it easily changed course with a twist of a knob.

The Altitude Hold function was dead-on.

Also, automatic pitch trim is a big plus.  It works when the autopilot is on even if Altitude Hold is not engaged.