Dave,
I sold my MK 55 autopilot that I had for 10 years still worked good. Bought 70lb. power drive with I pilot. I love the I pilot but its not been without its problems. at times it refuses to steer , head locks up. I have to push the steer button while holding the head then it starts working right..
The best thing I like about it is the anchor mode. works great even in a strong wind 20+ mph. I hope it lasts through this weekend then in for warranty works
steve