So far, I love my Forno stone. I have only used the cooktop and oven once. The photo in the installation instructions seemed to be off a bit as to where to install the electrical outlet for the plug and the gas connection. All were fixes we could handle; it just would have been nice to have those in the correct location during construction.
This is comparable or better than any to any of the major appliance makers (Wolf, Subzero, etc.). Make sure you contact someone at Forno for the details on installation requirements, measurements etc. They are not always easy to find. Other than that perfect.