My first 2 15oz jars (reused Marzetti salad dressing jars) turned out quite tasty. The color is slightly beige due to the psyllium fiber I added to make it more gelatinous.
My method was to make it overnight in a picnic cooler, the two jars of yogurt and milk kept warm with a plastic milk bottle filled with warm tap water. Using nonfat dry milk, the cost is much less than store-bought.