This product works well with the Sodastream carbonizer, and tastes identical to Coke. Yes, it requires twice as much syrup as the Sodastream cola, because Coke syrup is mostly simple syrup (equal parts sugar and water), and the Sodastream product, as actually advertised, replaces half of the simple syrup with artificial sweetener - which does indeed reduce the calories and the quantity needed, but adds an artificial flavor taste. Adding this product to the Sodastream 1-liter bottle, from the water fill line to the finish, actually adds as much syrup as Coca-Cola specifies for their dispensers and matches the Coke taste.