While the service was outstanding, the quality of the job was lacking. We had them re-pour a slab from a previous contractor for our carport. JJT did an outstanding job taking out the old concrete, laying clay, and pouring the slab. The only problem was the new slab sank. After a rain, we now have water all the way across the carport, some of it up to a 1/2" deep. They installed gutters (free of charge, I might add), but this did little to alleviate our problem. Well over a year now, and we're still fighting the water.