Great product but, the mess left behind was unacceptable. Large peices of concrete, concrete wash, rebar and peices of wood. Response from general manager, this is a large job and the debris left behind is normal. Instead of taking debris with them they bury it or cover it with sand. Still digging up concrete chunks buried around house and 2 x 4's. Job was started early Dec. 2010 completed late March except for clean up which I will have to do myself! Would not recommend Cable Lock(Olshan).