Mother in law had a pocelin installed. Told her at the time that the plumbing would last just as long as the plastic ones and that the only diff is cost and personal choice. Of course first thing she decided was to run out and buy a foam cushion residential seat which immediately broke the plumbing in the back of the of the toilet. After we got that cleared up she was unhappy with how shallow it was, then when the seal failed and the entire unit needed to be replaced she bought a plastic one. But, again, first thing she went out and bought a cushy seat again and it made the plumbing leak, but this time she at least suspected what was causing it to leak.....