UPDATE: Well, they had a few trouble-free weeks, anyway. Yesterday, my neighbors' Whirlpool front-loader started leaking again. It's leaking about the same amount of water and the front of the bulk detergent dispensing drawer is full of water, so I'm guessing it's the bellows again.
I bump into one or the other fairly frequently because I tend to wash a load every other day or two, as do they. I've never seen them overload or abuse the washer in any way.
So, their beautiful washer is surrounded with rolled up bath towels again. Megan was almost in tears yesterday-- whether from frustration or anger, I'm not sure--when she was mopping up the mess in our laundry area. Some water even dripped down the holes drilled in the floor for the water pipes, so she had to go downstairs to that laundry/hallway pass-through and mop, as well.