Poseidon was used by our neighbors. At that time, we got to know John and his work. We had him do a couple of concrete jobs over the years. Eventually we hired him to install our pool and hot tub. They also built the pool shed for us. We had done some research before we used Poseidon for the pool but he still won out compared to the others. It has been about 10 years now since we had the pool installed.