David did a lovely job with landscape rocks and design in general but he has not been reliable when things go wrong. Within a year of rebuilding our flagstone walkways the mortar began to disintegrate. He has not stood behind the work. In fact we have an entire walkway which is in far worse condition now than it was before we spent a considerable amount of money replacing it. We have given up trying to get him back here to address the problem and are very disappointed.