The company uses Unilock, and other high quality product, that doesn't mean they know what to do with it. Our yard was a complete disaster by the time they walked away according to several contractors we had take a look after Schonheit removed WAY too much dirt from our backyard in a project that actually required more dirt to be brought back into the property. They'll say we were too picky, impossible to work with, etc. yeah! We wanted to know what they were doing and then started to panic when realizing the situation.