The QEP xtreme is a great tool. However, it is NOT designed for ceramic or porcelain, so if ou use it for these materials, you will void your warranty.
I will add it to my list....these nippers will cut some stone and marble, depending on the stone....some stone is much softer than others. When it comes to the hardness of stone it is all about the glaciers and how Mother Nature created it. No one size fits all.