Friendly service during the job; very poor response to deal with issues following. Our natural stone patios and swimming pool coping have shifted and mortar joints have broken. The natural stone installed has "popped" and breaks apart when lifted. Swimming pool tiles are falling off because of shifting limestone coping. The stone was not installed properly and/or poor materials were used, resulting in a need to replace the work after only 5+ years. Mark refuses to even view the defective work, let alone deal with it. Three experienced contractors have looked at it - each has described it as a clearly defective installation.