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This particularly unit comes up regularly on several bulletin boards. Usually it starts with my 4000 broke and is followed by half a dozen other owners lamenting that there's has failed at one time or another as well.I can't recall all the examples. My two failed so I was already convinced, but I do recall/have experienced clutch failures (most common), mounting bracket broken, remote shorted from brief rainfall, motor shorted out, won't hold a course.Used on boats as heavy as 20K (too heavy perhaps?), 13K, 10K, and others I can't recall, but seemed appropriate.I'm sure there are more that I haven't heard or don't remember. Go ahead, take a chance with the 4000. It's not my money.Of course there are plenty of examples of units that still work. We would expect that, but what percentage of failures is necessary to consider this an unreliable product. 1%, 10%, 25%?I stick with my original statement. There has got to be a better autopilot out there. Even my 15 year old Autohelm 3000 has a reputation for being more robust than the 4000. And Denis even you were able to site a defect on your unit. Sure it was correctable, but should it have occurred at all? Isn't that type of problem generally an indicator of overall quality of the design and manufacturing process.If I had to pick ONE electronic product sold today that is notoriously unreliable I would pick the 4000.I'm just telling you I've observed and seen in writing. Feel free to believe what you wish.