I have the Logitech G9x and SteelSeries NP+ which as far as I know is the same as Qck heavy but thinner. I have had it for two to three years and it is clean and I have no problems. I like the cloth and soft feel. My mouse glides smooth and the pad does not fold or ripple with mouse movement.
If you do not care about material then maybe you want to find some performance comparisons between the two mouse pads.
The cloth material i think is better for my arm, that hurts a lot when i spend lot of time in the pc