So-so comfort, couldn't use it in my car
I bought two of these, one for my office chair and one for my car. I couldn't use the second one in my car at all - when it's cold outside, it's like sitting on a block of ice! I've been using the other on my office chair for a few months. I believe that it's just as durable as they say, and has definitely not sagged or developed indentations from my sitting on it. But, I can feel every bit of its waffle-like structure and, in the end, it has not been terribly comfortable.
Rating: 3 stars