We just finished a 20x42 with Nobel pre cast bull nose. We custom cast 18' double Bull nose for Spa an exposed beam side of pool. Material is great looking, never gets hot and matches the pre cast on the house perfect. We love the look and feel of the pre cast concrete. Now for the bad, It stains VERY easily. Any dirt or metal instantly stains and it soaks INTO the coping. The only way to get out stains is with acid, and the acid burns away the smooth surface of the coping. So in retrospect if it was an adult only pool it is ok, with kids not my first option.