The lid came off one of my TH feeder during a thunderstorm which totally soaked all the feed in it, but that was not the fault of TH. One of the handles had been damaged during shipping and would not latch properly.
My other problem feeder got that way because the lower housing got flooded. Again, not TH fault, I just had it too far into the pond and an extreme water event happened.
But it is true that they do sometimes leak around the edges, especially after a couple of years. Not a hard fix, though. My biggest fears are that this will jam & burn up the motor, or that the moldy feed will kill fish. Neither has happened to date.