We recently installed Mannington's Carmel (their newest product) porcelain tiles in our kitchen and only after installation we noticed the tiles are warped in the middle. Every tile has a small arch which is clearly noticeable. When we walk we can feel that the surface is not even with ups and downs.
When I called Mannington, they said they cannot entertain any claims because their warranty states I should have called them before installation. But the fact is they supplied a defective material to start with.
I had spent so much money only to hear this company talking about warranty :-(, a piece of paper they have put together. They didn't even want to check the product to make sure the next customer wouldn't be affected.