I purchased the DuraGrid tiles because they can be laid over dirt, are water resistant, and allow water to drain. My crushed rock patio has water stains and is not wearing well. These tiles were fairly easy to install even though the surface was not level. We cut them with a band saw to fit the space as it is has no straight edges. It took about 90 minutes. The end result exceeded my expectations. I wish they were a little cheaper, but compared to wooden deck tiles they are a great value.