I had an AT Pro and AT Gold. My AT Gold control box completely broke off of the shaft when it tumbled down a rocky hillside about 10 feet. It was replaced under warranty. I have heard of this happening on these forums a few times.
I have over 2000 hours on the Equinox 800 in high mountain, woods, desert, extreme cold (below 20 F) and extreme heat (100+ F). I have submerged it in fresh water several times. I have not submerged it in saltwater. It has crashed a few times too when its clumsy user lost his footing. Happens too much at my age.....I have had a control housing cover on it when danger of cracking the screen was possible. I have always used an armrest cover. I did upgrade the shaft to one of the Steve Gross graphite shafts which I really like....thanks Steve.
I have had absolutely zero problems..........
If I did have a problem with the control housing, shaft or coil, Minelab would take care of it under warranty.
Jeff